This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This subterranean necropolis holds three floors of antler-dug grave caves.

Erotic art covers the walls of the largest ancient pleasure palace.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A large circus museum with summer performances.

"A hideous albatross in the Hudson River Valley."

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.