The last surviving submarine from a strange chapter of Finnish history.

An ethereal glowing blue ocean cave in Croatia.

This island castle now hosts a world-famous opera festival.

This building featuring Brutalist architecture has a rich media production history.

Hundreds of signs pointing to the birthplaces of current Helsinki residents form stalactites on the ceiling of the cave-like Kamppi metro station.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This former hospital was once one of the oldest mental health facilities in Europe.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This church also serves as a lighthouse complete with a beacon.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

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

This Elizabethan hedge maze is one of only six in North America.

This spooky statue sits outside a famous Prague theater.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

The Hveragerði fissure runs through this unassuming shopping center.

Ride a mechanical corn dog at the alleged birthplace of America's favorite deep-fried wiener.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

A natural swimming hole that was once a ceremonial center for Mayan priests.

The decaying remains of a ship whose captain mysteriously disappeared.

This sacred site lives up to its name with its majestic, color-splashed sandstone formations.

One of the most comprehensive collections of historic Native American culture in the country reframes artifacts as artwork.

The oldest restaurant in Portland serves fiery coffee cocktails and an astounding amount of turkey.

This theatre and its amazing marquee harken back to the Golden Age of Hollywood.