The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A fountain standing as a testament to a doomed alliance.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

This airport also offers travelers the chance to view thousands of years of Turkish history.

This sprawling stronghold has been at the center of some of South India's bloodiest wars.

This colorful colonial neighborhood in Panjim is one of the only Latin Quarters in Asia.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

World's tallest monolithic statue has served as a pilgrimage site since its completion in 993 CE.

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.

Half-size replica of the Taj Mahal.

Nineteen ancient rock-cut Buddhist caves can be found on the outskirts of Mumbai.

At 8,000 feet, the world's highest tea estate draws visitors for both its products and its panoramic views.

An ancient iron pillar in Delhi that seems to be rustproof.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

Modest by day, illuminated majestically at sunset.

A former bastion of Rajput chivalry, this massive hill fort is the site of legend and tragedy.

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

A blooming house of worship for the masses.

An extraordinary "City of Caves" carved from solid stone.

A complex of six forts embedded in the Rajasthan hills.