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

15 monolithic temples emulate an eroding sand castle.

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

The largest tiger reserve in India is a vast expanse dotted with ancient ruins of Nagarjuna Viswa Vidyalayam.

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

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

A nearly unconquerable island-fort in the Indian Ocean.

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

A centuries-old lookout post still sits atop a natural stone spire.

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

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

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

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

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

Sacred Indian temple that’s all monkey business.

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

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

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

A mecca for India's Jains.

Centuries-old bridges grown from tangled roots.

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

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

This hulking behemoth is actually five interconnected towers built in the 1960s.