This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The house that took a plunge into the facade of a museum.

Baroque celebration of the end of the Great Plague of Vienna.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.

A blooming house of worship for the masses.

The former Willingdon Airport started operations in 1929, in India's capital, Delhi. Now, it's used for maintenance runs and helicopter rides.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The world's second-largest sundial, made entirely out of stone.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

This precariously balanced boulder is said to be a hunk of stolen butter dropped by the gods.

Picnic on the seashore in the footsteps of ancient kings, protected by giant mythical cat beasts.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Extraordinary sculpture garden created by an eccentric English poet.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.