Chichicastenango, Guatemala

see here for list of top ten tombstones

Skulls in British Churchs and Churchyards

flickr group here

Beinhaus

Another Karner/Beinhaus/Charnel House/ossuary, this one with over 600 painted skulls.

Located in Halstatt, Austria, which makes the UNESCO world heritage list.

See here.

More to see here. Why isn't there an English wiki entry?

Here is a good list of global ossuaries, including

Chapel of Skulls, Czermna, Poland

Brno Ossuary, Brno, Czech Republic

and

Skull Tower of Niš, Serbia

Capuchin Catacombs, Palermo

like the wonderful ossuary at sedlec, an amazingly decorative Charnel House (bone house).

[more info]

Salvation Mountain

Salvation Mountain, near Slab City on the West Coast of the US.