The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

It's a mystery why these remains were found with no traces of their bodies in sight.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

An aptly-named street near the birthplace of the modern LGBT rights movement.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This unusual apartment building may be Brooklyn's own version of the Leaning Tower of Pisa.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

A quaint Russian village in the middle of a German metropolis.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

You've probably seen these distinctive orange-tiled columns on the big screen.

Home to the oldest operating roller coaster in the Southern Hemisphere.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

A thought-provoking outdoor art installation sits in the seat of German law.

Along the Rhine, about a mile from the historic Munster, learn the heartrending story of two lovers torn asunder, cast into unknown layers of time and space.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

Flowers have mysteriously appeared on her effigy every day for the last 150 years.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.