Show cave Hollgrotten (Switzerland) is open to public
One of the most interesting show caves of Switzerland Höllgrotten is open to public from April 1. It is situated in a German speaking part of Switzerland, in Baar town which is not far from Zurich
The underground fortifications of Dillenburg Castle (Germany)
300 new LED lamps show the casemates in a new light
Our project in the underground fortifications (casemates) of Dillenburg Castle has been successfully concluded.
