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

Siddhartha Gautama sat here and received enlightenment.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

The painted and decorated towers of this Hindu shrine were once the tallest structures in one of the oldest cities in India.

The world's largest secondhand book market is a haven for bibliophiles and bargain hunters.

An eclectic mix of influences rot together in harmony in this India necropolis.

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

A centuries-old fortress city lies in ruin.

Modest by day, illuminated majestically at sunset.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

This ancient Hindu temple is covered in thousands of colorful statues and has a long mythological history.

A blooming house of worship for the masses.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

A complex of six forts embedded in the Rajasthan hills.

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

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

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

Rock-cut cave complex filled with ancient Buddhist artwork.

Sacred Indian temple that’s all monkey business.

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

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

The remains of what was, not so long ago, the world's largest city.