These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Check the time in 145 countries at once with this East German relic.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

An empty bookshelf commemorates the books which were lost during the infamous event

A famed artist's inspiring work of peace and tolerance.

A rare chance to ride one of the few continuous elevators still in operation.

Fantastic views and thousands of love locks.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This pebble beach is so beautiful that taking its rocks is against the law.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

This steep-walled ravine contains animal-shaped formations made from sandstone.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

A tiny 1857 chapel sits on top of a secluded, forested hill.

Prayers and messages of hope decorate the ceramic tiles of this pavilion.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

The arboretum whose marshy soil sucked up the dreams of housing developers.

More than 5,000 contemporary and "historic" mustards from around the world.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

Probably the only remaining trace of a leprosy house in Wisconsin, reflecting a time when leprosy was uncurable and sufferers were isolated.

Small-town museum dedicated to outer space ... and bicycles.

This downtown statue pays tribute to the Native American game that gave the city of La Crosse its name.