Similar to 地下

Crypt

Hollow Earth

Chichu Art Museum

Derinkuyu

Domus Aurea

Ħal Saflieni Hypogeum

Semi-basement

29th century BC

28th century BC

27th century BC

26th century BC

25th century BC

24th century BC

23rd century BC

22nd century BC

20th century BC

19th century BC