This museum sits on the site of a decommissioned military communications base.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

The fastest way to send a message before electricity was invented.

Located on the banks of the St. Lawrence River, this mansion is home to a massive art collection.

This open-air, narrow-gauge railway museum pays homage to the region's transportation history.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

In this quiet village, a blue plaque marks the spot where the famous fictional detective retired.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

This facility, now a museum, once housed and trained U.S. Army Air Force pilots who flew during the Allied invasion of Normandy.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

During World War II, blimps were a key part of the United States' defense against German U-boats—this building could house a dozen of the armed airships.

Featured in one of the most iconic scenes in cinema history.

A museum befitting the city responsible for supplying the majority of the world's LSD.

The world's oldest railway bridge in continuous use.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Art Deco stylings conceal the true nature of this bridge.