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

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

A nearly unconquerable island-fort in the Indian Ocean.

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

A centuries-old fortress city lies in ruin.

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

Modest by day, illuminated majestically at sunset.

A blooming house of worship for the masses.

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.

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

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

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.

Sacred Indian temple that’s all monkey business.

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.

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.

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.

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

A mecca for India's Jains.

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