A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

The biggest cave system in the Arabian Peninsula is home to a rare variety of blind fish.

A collection of objects supposedly singed by the hands of souls in purgatory.

One of the most important yet well-hidden museums dedicated to the history of medicine.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

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

Ancient traditions and surreal birdwatching come into sharp relief along one of the world's most polluted rivers.

Dozens of bronze sculptures are woven into the landscape along this trail.

Made by a man on a worldwide sanitation crusade.

The roof of one of the world’s largest spice markets provides a grand view over the neighborhood's glorious bustle.

India's first open-air public art district sits in the heart of the country's capital.

These murals celebrate the oft-overlooked legacies of Iraqi-Jewish actresses in Bollywood.

The world's second-largest sundial, made entirely out of stone.

In the 19th century, this was the center of Boston's Black community.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

Narrowest house in Boston.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

One of the few remaining monuments dedicated to South Boston's Irish heritage.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Dim sum, served in a grand old theater.

An aromatic exploration of the rich history and flavors of this German town's famous gingerbread.

Deep in the Thar desert, a temple crawling with thousands of holy rats.

Nestled among the artifacts of the National Crafts Museum, this hidden gem offers hard-to-find regional foods from all over India.

Time has stopped at the house where Gandhi died.