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

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

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

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

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

A complex of six forts embedded in the Rajasthan hills.

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.

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

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.

An allegorical statue of a giant pregnant woman representing justice and truth.

Built in 1911, the Tees Transporter Bridge is one of only six transporter bridges still in operation.

This old Victorian bathhouse is fed by an ancient spring.

This suburban British town holds secrets that would have made the druids proud.

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.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

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

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.

One of Indonesia's tallest, this waterfall takes a 390-foot plunge into the Lake Toba caldera.

Of five volcanoes located in the massive Tengger caldera, this cone is the youngest and most active.

Visitors to this museum will find architectural oddities, an art gallery, and an unlikely bird sanctuary.