Stockholm's deepest subway station is also a stunning ecological wonder.

This Stockholm light tower can be controlled by anyone with a smartphone.

It houses the remains of a 17th-century version of the Titanic.

The library's graceful rotunda is like a bibliophile's temple.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

An abandoned church gets a second life as a massive beer hall and event space.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

An eerie, decaying ghost town destined to fade into the forest.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

This free, take-a-book shop seems like a trick but isn't.

This New England drive-in was built to straddle the border between two states.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

Maybe the only missile installed in a public park, this Cold War leftover was one of the first to carry a nuclear warhead.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The world's largest rotating world.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

Iconic rock formations that allow for exploration during high or low tide.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.