By waves smashing against the sea walls
Crystal Caves was created on 1991-10-23.
City of Caves was created in 2004.
The Caves of Drach was created in 1977.
The Lotus Caves was created in 1969.
The Caves of Altamira was created in 1976.
Borra Caves was created in 1807.
From the Caves of the Iron Mountain was created in 1997.
Waitomo Glowworm Caves was created in 1889.
The Secret of the Caves was created on 1929-05-01.
Waitomo Caves Hotel was created in 1908.
Oregon Caves Chateau was created in 1934.
Rio Camuy Caves was created in 1987.