A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

Geometry and mystery come together in an epic show of octagonal masonry.