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

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

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.

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.

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

Centuries-old bridges grown from tangled roots.

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

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

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

Home of Philip Johnson, one of the 20th century's most influential architects.

Glacial erratic or man-made dolmen? It probably wasn't druids.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.