A startling, centuries-old subterranean marvel hides in plain sight.

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

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

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

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

This 17th-century mausoleum is topped with an acoustic marvel.

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

Deep in the Thar desert, a temple crawling with thousands of holy rats.

Remote town home to Himachalis, Israelis, and tons of hashish.

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

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

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

A centuries-old fortress city lies in ruin.

A blooming house of worship for the masses.

This hilltop warren of monastic dwellings is the result of centuries worth of Mongol attacks.

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.

A single tree's 2,800 aerial roots give the appearance of a complete forest.

Rock-cut cave complex filled with ancient Buddhist artwork.

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

Sacred Indian temple that’s all monkey business.

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

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.