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Trass caves – Trass Caves Brohltal loop from Wassenach

Routes

Hiking trails & Routes

Trass caves – Trass Caves Brohltal loop from Wassenach

Moderate

4.3

(104)

317

hikers

Trass caves – Trass Caves Brohltal loop from Wassenach

03:01

10.9km

190m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: May 16, 2026

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Your route passes through a protected area

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Rhein-Ahr-Eifel

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2.89 km

Bench by the Stream in Rhein-Ahr-Eifel

Highlight • Rest Area

It is a good place to take a break and the sound of the water has a pleasantly relaxing effect.

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3.36 km

Old Stone Bridge Over Brohlbach

Highlight • Bridge

A relic of past centuries, nestled in a moss-covered path and surrounded by a rushing stream.

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3.59 km

Trass caves

Highlight • Cave

"The sky in the Brohl Valley darkened as the Laacher See volcano erupted just five kilometers away. A blazing-hot mixture of lava particles and gases shot into the atmosphere at intervals. Each time the eruptive column collapsed, the material raced through the surrounding valleys as if on a cushion of air – ash and lava particles filled the valleys up to 60 meters high. The once loose materials of the pyroclastic flow have, over time, baked into a rock known in our region as "trass." The Romans already mined trass in the Brohl Valley and used it, among other things, for house construction. Finely ground, with the addition of lime and water, it produces a mortar that hardens even underwater. It is likely that it was the Dutch who promoted mining in the Brohl Valley since the 16th century, as trass is ideal for building dikes and harbor facilities. They were also the ones who gave the volcanic cement its name: "Tyrass" is Dutch for "glue." The trass walls you see from here have been hollowed out by mining and can be visited. Due to their poor quality, they were no longer of interest for mining and today are an impressive testament to the massive pyroclastic avalanche that once filled the entire valley.
eifel.info/a-trasshoehlen

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