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

This historic, palatial theater is now one of the world’s most beautiful bookstores.

An enormous concrete structure built over a nuclear crater.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

French scientists make up the majority of the few humans to occupy this remote island in the extreme southern Indian Ocean.

This massive monument honors the first human in space.