Further Lovecraftian places that really exist:

Eye of Africa (the Richat Structure), Mauritania.

‘Sentinels of the Arctic’ (wind/snow formations, Finnish Lapland) — picture by Niccola Bonfadini.

Entrance to the Borgund Stave Church, Norway — picture by Lightbender.

Catholic convent catacombs, Lima in Peru.

Basalt cave entrance, Akun Island — picture by Steve Hillebrand, U.S. Fish and Wildlife Service.

Stephen Whitney crypt entrance, Greenwood Cemetery (Lovecraft visited this cemetery while in New York).