Geißenklösterle

The Blautopf (German for Bowl of the Blau, 'blau' means blue) is a

The Hohle Fels (also Hohlefels, Hohler Fels, the German for 'hollow

Dellmensingen Castle is an early Baroque castle in the Upper Swabian

The fortress of Ulm (Bundesfestung Ulm) was one of five federal

Ulm Cathedral (Deutsch. Ulmer Münster, literally: minster) is a

Aufi or Funkturm Aufhausen is the name of the police radio tower in

The legendary Reussenstein Castle (Ruine Reußenstein: the

Ruine Helfenstein represents the remnants of the fortified castle

Sterkfontein (Afrikaans for Strong Spring) is a set of limestone caves

Uplistsikhe (უფლისციხე; literally, 'the lord's fortress') is an

El Soplao is a cave located in the municipalities of Rionansa,

Tsankawi is a detached portion of Bandelier National Monument in New

Jebel Irhoud is an archaeological cave site located near Sidi Moktar,