A rare example of World War I trenches from the British front.

This British museum hopes to take the taboo out of poo.

A medieval military street hidden beneath a charming French fishing village.

What looks like missing grout is actually an old pub's peephole.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This gorgeous space is England's largest independent library outside of London.

This home on a quiet suburban street is completely covered with vibrant mosaics.

A Swiss board game museum housed inside a picture-perfect castle.

The bartenders at this crime-fighting theme cafe are actual private detectives by day.

The steepest classic funicular in the world glides along a dizzying incline.

A public display of prehistoric space rocks is named for the Namibian village where they were found.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

The secret medieval communication system will whisk your words above the noise of the crowd.

Why walk on this historical site when you can zoom down instead?

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

The world's oldest optical museum is an odd collection where the exhibits look at you.

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

Hundreds of mummies in a silent room, some with eerily pained expressions preserved on their faces.