An unusual round church in London with a Templar past.

Rebuilt remains of a temple to Roman god Mithras.

The Great Fire of London and the regulation of one-way streets both started in this alley.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

American bombs, morbid memorabilia, and graphic photographs tell the story of the CIA-led “Secret War” from the Pathet Lao perspective.

This Khmer temple is named after a young woman who sacrificed herself to protect the city from a disastrous deluge.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

This fountain was designed to honor the man who helped bring water to Barcelona.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

This semi-secret storybook hedge maze is also the oldest garden in the city.

The unexpectedly beloved remnants of a controversial thermal power plant.

Mountain where Jesus was first tempted by the Devil.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Arguably Belgrade's only example of pure Art Deco architecture.

An early 20th-century bullring converted into a modern shopping center.

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

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

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

The site where two doves fell in love.