Ride the subways of yesteryear.

This 16th-century monastery has been turned into a surrealist architecture compound.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

360° views of the city plus five floors of optical illusions and hands-on science.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A dilapidated dock tells the story of Titanic's missed arrival.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

One part local history, 99 parts gruesome haunted house.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A beautiful but toxic fountain of mercury.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A marvel of Byzantine engineering under the streets of Istanbul.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The most visited, and possibly most controversial, museum in Germany.

Extraordinary sculpture garden created by an eccentric English poet.

A haunting collection of the vanished and disappearing natural world.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A fantastic castle rumored to be the birthplace of King Arthur.