Vindija Cave

Opeka Manor (also known as Bombelles Manor) is a castle in the Vinica

Maruševec is castle located in the municipality of the same name

Trakošćan (also spelled Trakostyan) is a castle located in northern C

Gamla borgen Varaždin (kroatiska: Stari grad Varaždin) är en borg i Va

Aquae Iasae was the Roman settlement and Roman bath in the area of

Banfi Manor (Croatian: Dvorac Banfi or Kurija Banfi) is an old

Čakovec Castle or Zrinski Castle (Croatian: Čakovečka utvrda or St

Feštetić Castle (Croatian: Dvorac Feštetić or Kaštel Feštetić) is a c

The Ear of Dionysius (Italian: Orecchio di Dionisio) is an artificial

Hezekiah's Tunnel, or the Siloam Tunnel is a tunnel that was dug

Lava Beds National Monument, located in Siskiyou and Modoc Counties,

Beer Quarry Caves is a man-made limestone underground complex located

The Balzi Rossi caves (Ligurian: baussi rossi 'red rocks') in