Last stop before the top of the highest peak in the world.

The former Willingdon Airport started operations in 1929, in India's capital, Delhi. Now, it's used for maintenance runs and helicopter rides.

The world's largest human gathering is held at the confluence of three sacred rivers, one of which is mythical.

A small town in Rajasthan has been dubbed the "City of Stepwells," and Raniji ki Baori is the queen.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

An ancient curse kept humans from living on the water, and now it's brimming with rare wildlife and is one of the most pristine rivers in India.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

This restaurant is proud to be built atop a burial ground.

This abandoned stepwell is one of the largest, deepest, and certainly one of the creepiest in India.

Time has stopped at the house where Gandhi died.

The abandoned site of the Beatles spiritual awakening and subsequent revolt.

Siddhartha Gautama sat here and received enlightenment.

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

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

A centuries-old fortress city lies in ruin.

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

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

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

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

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.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

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