The Mullerthal, Luxembourg's country of sandstone and mills

Luxembourg has a reputation for being flat and full of banks, and the Mullerthal undoes both ideas within ten minutes of walking. In the east of the country, right on the German border, the ground breaks up into blocks of mossy sandstone, corridors between rock walls and streams that once drove mill wheels. That’s where the Little Switzerland nickname comes from. It oversells the mountains, but I can see why it stuck.

Two Mullerthals, one name

The word covers two things. One is the tourist region run by the regional office in Echternach, which lists 14 communes, from Echternach and Berdorf to Larochette, Junglinster and the Vallée de l’Ernz (the full list is in the table). The other is the hamlet of Müllerthal, in Waldbillig, a handful of houses in the Black Ernz valley that lent its name to everything else. In Luxembourgish it’s Mëllerdall, the valley of the millers.

Eleven of those communes also make up the Natur- & Geopark Mëllerdall, set up in 2016 over 256 km² with 22 geosites. It joined UNESCO’s Global Geoparks network in April 2022. Add the Echternach dancing procession, inscribed in 2010, and the region holds two UNESCO labels. Those in the rest of the country are gathered in Luxembourg UNESCO World Heritage.

What I like most about the Mëllerdall UNESCO Global Geopark is that it has no fences. visitluxembourg explains that it’s both a nature park, a status Luxembourg law reserves for regions with a special cultural and natural heritage, and a geopark because of its sandstone, one of the most imposing landscapes of its kind in Western Europe. You’ll spot the signs with its logo along the main roads, and the quickest way to make sense of it is its free exhibition in Beaufort, close to Beaufort Castle.

Where the Little Switzerland look comes from

It’s all about the rock. The government portal explains that more than 200 million years ago this was seabed, the sea withdrew and rivers cut down through the Luxembourg sandstone to leave today’s landscape. The same source ranks the sandstone of the Black Ernz, White Ernz and Lower Sûre valleys among the most striking formations in western Europe, and it also stores the region’s drinking water.

On the ground that means gorges like the Wolfsschlucht gorge, 40 m deep, cracks you climb with iron ladders, caves where millstones were cut and passages so narrow and dark that the Trail website tells you to bring a torch. There are no peaks. What you get is dense beech wood, damp air and rocks shaped oddly enough that every one of them has a name.

Once your dates are set, check which hotels are still free in Echternach before prices climb.

Echternach, where most visits start

The region’s main town is Echternach, Luxembourg’s oldest, on the Sûre and facing Germany. It grew up around the abbey Willibrord founded in 698, and the basilica holds his tomb. Every Whit Tuesday the dancing procession sets off from there. On the edge of town there’s a 30-hectare lake with free swimming in summer and what’s left of a large Roman villa.

Two of the three Mullerthal Trail routes start in the town too, so it’s the obvious base. You’ve got restaurants, shops and a tourist office opposite the basilica, and twenty minutes on foot puts you among the rocks.

Walking is the point

The Mullerthal Trail is 112 km of waymarked path in three circular routes, with the European Ramblers Association’s Leading Quality Trails - Best of Europe label. Route 2, from Echternach through Berdorf, Müllerthal and Consdorf, is the rock route. Route 3 links the Black Ernz valley with the castles at Beaufort and Larochette. Route 1 heads along the Sûre to Rosport and the Girsterklaus chapel.

If a 36 to 40 km loop sounds like too much, every village has shorter local circuits. Berdorf alone advertises 50 km of its own paths. The government portal also lists five mountain-bike trails, 16 road-cycling circuits and five national cycle paths, the flat, wide kind that work for families.

Once your dates are set, check which hotels are still free in Echternach before prices climb.

Castles, cheese and a battery pioneer

The rocks aren’t the whole story. Beaufort has two castles, a medieval ruin by a pond and a 17th-century Renaissance house beside it. Larochette’s ruin sits on its spur above the village, and Bourglinster has a well-known restaurant inside its walls. Rosport has the Tudor Museum, about the pioneer of the lead-acid battery. Up on the plateau there are fruit trees everywhere, and Berdorf’s cheese is known well beyond the border.

When to go and how long to stay

STATEC counted 20 hotels and 19 campsites in its Mullerthal region in 2025, with more than 12,000 camping places against fewer than 900 hotel beds. That tells you who comes here. Hotel stays averaged 1.79 nights. I’d book early for summer and for Whitsun week, when the procession fills Echternach, and compare the hotels in Echternach with the villages on the Trail.

One practical tip from the Trail website itself. In the hunting season, check geoportail.lu to see whether there’s a shoot in the woods you plan to walk that day. It’s not something a travel guide usually mentions, but here the forest is most of the map. Within the region, Junglinster has more than 250 km of waymarked paths, one of the largest networks in the area according to its council.

If you would rather have a local show you round, book a guided tour in Echternach and choose by the reviews.

A car frees you from timetables: search car hire in Luxembourg on DiscoverCars and compare companies.

So you do not pay over the odds, look at trains, coaches and flights to Luxembourg on Omio and pick the one that suits you.