In the Oppenheim basement labyrinth you can experience 1,000 years of history at your fingertips. The "city under the city" is connected by numerous corridors, rooms and stairs and once …
The Rhine and its tributaries have cut deep valleys into the high plateau of the Hunsrück in the Bacharach area, on the slopes of which slate occurs, which was used …
There is a slate cave on the serpentine path from the Kaub ferry to the fields near Henschhausen. No tunnel, so not deep, but suitable for a group as a …
According to the official maps, the tunnel leading into the north-facing slope is the "Gute Hoffnung pit". Access is blocked by a massive grid in favor of the bats.
In a hairpin bend in the Rheingoldstraße in the Leimbach valley, a tunnel leads deep into the mountain. At the beginning, however, this is filled with about 30 cm deep …
Behind a dilapidated wooden shed a few meters from the cobbled Koblenzer Straße (district road), a brick mouth leads into a tunnel, which leads a few meters into an extended mining area.