Monkeys lounge around at this 13th century temple.

Bangkok's men with dangerous jobs come here in search of protective talismans.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A limestone wonderland of water and subterranean secrets.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An artistic tribute to the famous singer, just around the corner from where he was born.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The commemorative stone column conceals a secret laboratory.

The castle still holds traces of the abandoned Roman fort it was built atop.

Stroll through Welsh history in a village of reconstructed structures.

Go deep down into the earth to experience the world of Welsh coal miners.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

The abandoned funicular tunnel was a secret base for the BBC during World War II.