This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

World's most expensive home.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Rebuilt remains of a temple to Roman god Mithras.

Notorious artist squat renovated into legal studios.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

An astounding collection of medical specimens, including bits of President Lincoln.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A church of bones, decorated with 40,000 human skeletons.

This lab's maddening silence is good for business but bad for sanity.