A place steeped in history that may be best known as the set of a 1960 film.

These rose marble urinals are the most luxurious loos in Liverpool.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Rock carving created 1,300 years ago 75 feet off the ground.

The Bulgarian royal family exclusively used this ornate, now-abandoned train station.

Walk through history in a palace that has seen centuries of Muslim rulers.

The most remote tree in the world survived desertification, but not a drunk truck driver.

These ancient giraffes are the largest known animal petroglyphs in the world.

The tallest mud-brick structure in the world has been standing since the 1500s.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

Home to the longest wooden escalators in the world.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

A repurposed railway tunnel with otherworldly acoustic characteristics.

This psychedelic tourist trap is a leisurely descent into madness.

In Hong Kong, a fairytale flower tunnel is hidden within the gardens of a public housing complex.

The romantic botanic tunnel feels like a well-kept secret.

Just off the city’s central station hides a quaint lamp-lit alley into medieval Elsinore.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

These bamboo and rope bridges cross the Nam Khan River for six months every year.

A hidden alley with seven corners and handmade cat decorations.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

One of just five sand-floor Jewish synagogues in the world.