Hidden within the caves (Coves del Drach) is Lake Martel, one of the largest subterranean lakes in the world
Published about 3 years ago by Foundation Stiftung Suedtiroler Sparkasse - Alpenverein Suedtirol AVS - 3D-Pixel GmbH
Published about 5 years ago by Erik Krause
The market hall in Martel (department Lot, France) origins from the 12th century. The roof is a demanding, self-supporting wooden construction.