This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

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

A complex of six forts embedded in the Rajasthan hills.

A blooming house of worship for the masses.

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

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

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

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

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

The world's second-largest sundial, made entirely out of 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 second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

A mecca for India's Jains.

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

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

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

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

Centuries-old bridges grown from tangled roots.

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

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

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

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

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