Source: Flickr / dandiffendale
Tas Kule, a 4th century BC freestanding rock-cut tomb located a few km east of the ancient city of Phokaia, modern Foça, Turkey.
This structure displays both Achaemenid period and local Anatolian (Lycian) architectural styles. With some surfaces unsmooth, it appears as though the building has been somewhat unfinished. The tomb is empty of its contents, and has a false door at the front.
Photos courtesy & taken by Dan Diffendale.