Mullerthal - Luxembourg's Little Switzerland

Discover spectacular caves and rock formations on a challenging trail to the Grotte de l'Enfer (Hell's Cave) and a gentle return along the Black Ernz.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 11.27 km
  • ◔
    Average duration: 4h 05 
  • ▲
    Difficulty: Moderate

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 310 m
  • ↘
    Descent: - 306 m

  • ▲
    Highest point: 350 m
  • ▼
    Lowest point: 191 m

Photos

Description of the walk

Parking in the centre of Mullerthal towards Waldbillig, opposite the campsite.

Signpost W3

(S/E) The entrance to the Cascades Hotel is on your right; turn left.

(1) At the end of the Le Cigalon hotel-restaurant buildings, cross the road. Head towards the entrance in the hedge. Cross the footbridge (washed away during the floods in July 2021, if not replaced, see practical information) and go up to the road. Turn left and continue along the forest path leading into the forest. At the crossroads, keep left until you reach a road.

(2) Take the steps on your right and go back up into the forest. Continue straight ahead on the wide path.
At the next intersection, take the path on the right, keeping as close as possible to the rocks. You are now at Keltenhiel. There are steps on your right leading up to the caves, which you are free to explore. Then return to the path to continue. At the barely visible crossroads, turn right. Further on, you will think you have reached a dead end, but go around the tree that is blocking most of the opening and pass under the rock to continue. Ignore the path that cuts across the trail and you will arrive at the signpost.

(3) Leave the path on your right and continue down between the rocks. Go down the stairs, cross the small footbridge and continue along the path. Take a series of steps made of beams or stones, going up and down, to walk along or slalom between the rocks until the end of the path, which leads to a wide forest path.

(4) Turn right and go up this wide path. Turn left and pass between the rocks. Don't worry about the steps on your left or the path coming from your right, but go down to the steps on your right before you reach the road.

(5) Climb these stairs to explore Werschrummschlüff: a maze of narrow passages between rocks. Follow the arrows painted on the rocks to find your way through the maze. At the end of this journey, finish your visit by taking the steps in front of you that lead to the viewpoint above Predigtstuhl. This will take you back to the path you came down a few moments earlier. Then retrace your steps and take the path on the left until you reach the steps.

(5) This time, continue downhill until you reach the road.

(6) Cross it. Continue to the right and a little further on, take the path on your left crossing Binzeltschluff. Ignore the path coming from the right after the stairs. Continue straight ahead. At the fork, turn right.

(7) The path arrives near the cave. Turn right to visit "Hell" and retrace your steps to arrive at the signpost.

(8) Turn left and take the wide path downhill. Keep on the main path.

(9) Cross the paved road. Continue downhill until you reach another road. Cross it and continue to the right. Ignore the road on your right. Cross the bridge to reach the next intersection.

(10) Turn left towards Beaufort.

(11) At the fork, take the road on the left towards Château Grondhaff, which you will see ahead of you.

(12) Take the path to the left of the private entrance to the château and follow the river from a distance, with the meadows on your left and the forest on your right. Further on, cross a ford. At the next intersection, ignore the path on your right and climb gently up to the left into the forest. Continue along this main path until you come out at the back of the campsite, facing the car park (S/E).

Waypoints

  1. S/E : km 0 - alt. 215 m - Mullerthal car park
  2. 1 : km 0.21 - alt. 211 m - first road on the left
  3. 2 : km 0.81 - alt. 230 m - Stairs near the road
  4. 3 : km 3.01 - alt. 327 m - Directional signpost
  5. 4 : km 3.76 - alt. 335 m - Wide path
  6. 5 : km 3.97 - alt. 334 m - Werschrummschlüff stairs
  7. 6 : km 4.31 - alt. 328 m - Binzeltschluff stairs
  8. 7 : km 5.43 - alt. 350 m - Grotte l'Enfer
  9. 8 : km 5.47 - alt. 337 m - Directional signpost
  10. 9 : km 6.46 - alt. 212 m - Road intersection
  11. 10 : km 6.74 - alt. 201 m - Intersection towards Beaufort
  12. 11 : km 6.83 - alt. 214 m - Route to the castle
  13. 12 : km 7.49 - alt. 203 m - Path around the castle
  14. S/E : km 11.27 - alt. 215 m - Mullerthal car park

Notes

the first part is very wild and difficult due to the number of rock bypasses and therefore the number of ascents and descents made on rock steps or beams used for this purpose.
Waterproof shoes with good grip are essential as the ground is very slippery due to leaves on the rocks and humidity.
There is no drinking water along the route.
Bench: between (3) and (4), between (6) and (7) and between (11) and (12)
Don't be claustrophobic if you want to explore Werschrummschlüff.
From October to December, check for information about hunting. Hunting dates

If the footbridge at (1) has not been replaced, retrace your steps to the front of the Cascades Hotel and turn left. Then turn left and walk along the road for a short distance. Take the dirt track opposite you and follow the trail (and the Mullerthal Trail signposts).

Worth a visit

Keltenthiel and its caves: the Celts, Saint Barbara and the Salamander.
Werschrummschlüff: a maze of narrow passages between rocks.
Predigtstuhl: rock overlooking the road. Impressive when viewed from below.
If you have to choose, opt for the Werschrummschlüff maze rather than the view from Predigtstuhl, as the climb up the stairs is not really worth the effort.
L'Enfer: a 55-metre-deep cave.
Grondhaff Castle: private residence, not open to visitors.

Reviews and comments

4.7 / 5
Based on 44 reviews

Reliability of the description
4.7 / 5
Ease of following the route
4.7 / 5
Route interest
4.7 / 5
A2line75
A2line75

Overall rating : 5 / 5

Date of your route : Mar 08, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Very pleasant hike.
Did it with two delighted teenagers aged 12 and 16.
You'll need torches to go through the Cave of Hell!
The start/finish point is great (large car park, playground, refreshment bar, etc.).

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User 21162826

Overall rating : 4.3 / 5

Date of your route : Feb 07, 2026
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very good hike with beautiful scenery and locations, a very good walk that is not difficult!

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User 27538286

Overall rating : 5 / 5

Date of your route : Sep 06, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

This was our first hike in Luxembourg, and everything was very well marked. We followed the Visorando directions just to be on the safe side, but following the numerous w3 markings is more than enough. Free parking and a pub at the end.
The entire last part (after the cave) is like a beautiful walk in the woods, which is still very pleasant.

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User 7346016

Overall rating : 5 / 5

Date of your route : May 10, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

On this warm day of 10 May 2025, we enjoyed a peaceful walk under the beech trees of Little Switzerland. We explored with curiosity the corridors between the sandstone giants. If you have a little time, after the Inferno (7), head towards Heroldt to lose yourself in the stone castle and enjoy the recently developed viewpoint at its summit. Then return to point (8) to stroll leisurely along the Schwartz Lernz. Realistic duration.

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CéciliaR
CéciliaR

Overall rating : 4.3 / 5

Date of your route : Mar 10, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

Very nice hike, especially the first part with those impressive rocks!
Realistic duration, worth doing again

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jeluke
jeluke

Overall rating : 4.7 / 5

Date of your route : Nov 18, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : No

Fun hike

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Doudoumarjorie
Doudoumarjorie

Overall rating : 4.7 / 5

Date of your route : Oct 05, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

don't hesitate, this hike is fantastic. There's a slight discrepancy with the GPS on this app, but nothing too serious..
A wonderful discovery and an enriching hike

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Chris574
Chris574
• Edited:

Overall rating : 5 / 5

Date of your route : Jul 29, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

the first part is more challenging, with elevation changes between rocks and ascending and descending steps.
the second part is very easy. It's great fun to be in the forest during a heatwave. Highly recommended

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benoit sabrina
benoit sabrina

Overall rating : 5 / 5

Date of your route : Aug 14, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Superb hike, magnificent scenery 🤩.
The trail is well marked, and if you have any doubts, Visorando is there to guide you.

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Lisa 1976
Lisa 1976

Overall rating : 4.7 / 5

Date of your route : Aug 14, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

We did this hike with children aged 13, 11 and 4... it's fairly easy and with time and breaks, even the youngest managed it!
We covered a longer distance than indicated by the app.
The scenery is beautiful, the children loved the landscape and rocks, and the signposting was excellent.
A very good experience!

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Lukowiak Michel
Lukowiak Michel

Overall rating : 4 / 5

Date of your route : Aug 07, 2023
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★☆ Good
Very busy route : Yes

The somewhat monotonous return journey

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Mona57
Mona57

Overall rating : 5 / 5

Date of your route : Jul 25, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A superb hike despite uncertain weather. The first part is more spectacular than the return after the Hell's Cave, which is more of a walk in the forest.

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Jotour
Jotour

Overall rating : 5 / 5

Date of your route : Jul 02, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A delightful summary of the paths between the rocks that are unique to this area. At the end of the day, you realise that the elevation gain is not insignificant....

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lazzerini
lazzerini

Hello mousse54,

thanks for the info about the footbridge.
It had actually been replaced after the flood two years ago, but last summer, on 14 July 2021 to be precise, there was another flood.
Just like in Belgium and part of Germany...

Best regards

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mousse54
mousse54
• Edited:

Overall rating : 5 / 5

Date of your route : Jun 26, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

It's still as magnificent as ever. I regularly take friends there to show them this walk and they are dazzled by the spectacle.
One small downside: the footbridge over the stream behind the hotel has disappeared. According to some people, it was "washed away by flooding two years ago".

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