Fortress of Ulm

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

Dellmensingen Castle is an early Baroque castle in the Upper Swabian

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

Geißenklösterle is a cave near Blaubeuren, Swabian Alb, Southern G

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

Schloss Oberstotzingen is a castle located at the north end of

Ruine Helfenstein represents the remnants of the fortified castle

Kaltenburg Castle is a ruined castle, located in the Lonetal (Lone

Suomenlinna, until 1918 Viapori, (Finnish), or Sveaborg (Swedish), is

San Juan de Ulúa, also known as Castle of San Juan de Ulúa is a l

Palamidi is a military fortress to the east of the Acronauplia in the

The Fortress of Luxembourg refers to the former fortifications of

Ehrenbreitstein Fortress (German: Festung Ehrenbreitstein) is a