This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Go inside to really appreciate this 500-year-old technological masterpiece.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.