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Cave

Trasshöhlen

Cave · Ahrtal · 126 m· open today
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  • Schattenspiel
    / Schattenspiel
    Photo: Kappest/Vulkanregion Laacher See, CC BY-SA, Kappest/Vulkanregion Laacher See
  • / In der Höhle
    Photo: Kappest/Vulkanregion Laacher See
  • / Wanderer
    Photo: Kappest/Vulkanregion Laacher See, CC BY-SA, Kappest/Vulkanregion Laacher See
  • / Höhle
    Photo: Kappest/Vulkanregion Laacher See
  • / In den Trasshöhlen
    Photo: Kappest/Vulkanregion Laacher See
  • / Wanderer vor den Höhlen
    Photo: Kappest/Vulkanregion Laacher See

The sky in the Brohl valley darkened when the Laacher See volcano erupted just five kilometers away.

 The once loose materials from the glowing avalanche have caked over time to form a rock that is called “trass” in our region.

The sky in the Brohl valley darkened when the Laacher See volcano erupted just five kilometers away.

A scorching mixture of lava particles and gases shot into the atmosphere at intervals. Every time the eruptive column collapsed, the material raced through the surrounding valleys like on an air cushion - ash and lava particles filled the valleys up to 60 meters high. The once loose materials from the glowing avalanche have caked over time to form a rock that is called “trass” in our region.

Even the Romans dismantled trass in the Brohl valley and used it to build houses, among other things. Finely ground, it produces a mortar with the addition of lime and water, which hardens even under water. It is obvious that it was the Dutch who had been promoting mining in the Brohl valley since the 16th century, because Trass is ideal for building dikes and docks.

They were also the ones who gave the volcanic cement its name: "Tyrass" is Dutch and means "glue". The trass walls that you can see from here have been excavated and can be visited.

Because of their poor quality, they were no longer of interest for mining and are now an impressive testimony to the huge glowing avalanche that once filled the entire valley.

Opening hours

open today
Sunday00:00–24:00
Monday00:00–24:00
Tuesday00:00–24:00
Wednesday00:00–24:00
Thursday00:00–24:00
Friday00:00–24:00
Saturday00:00–24:00
Immer frei zugänglich.

Coordinates

DD
50.457012, 7.295780
DMS
50°27'25.2"N 7°17'44.8"E
UTM
32U 379028 5590833
w3w 
///roofless.mobility.chiming
Arrival by train, car, foot or bike

Recommendations nearby

Thematic Trail · Romantischer Rhein
Geopfad Trasshöhlenweg (Unteres Brohltal) (Route U)
recommended route Difficulty easy Open
Distance 14.4 km
Duration 3:30 h
Ascent 357 m
Descent 358 m

Der Trasshöhlenweg führt entlang einer bezaubernden Landschaft, durch geheimnisvolle Höhlen, vorbei an natürlichen Mineralquellen durch die ...

5
from Sarah Stein Tourist-Information Vulkanregion Laacher See,   Eifel Tourismus GmbH

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Trasshöhlen

Brohltalstraße
56659 Burgbrohl
Phone +49263619433

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