A long-disputed lighthouse built on the wrong side of a Finnish/Swedish island.

The private clubhouse for the members of the Academy of Magical Arts.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

A giant pineapple, a symbol of hospitality, and an amazing vacation rental option.

These eclectic homes nestled into the cliffs of a Caribbean island were built entirely from scavenged materials.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

A world-class observatory in the California desert.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

An abused and forgotten metropolis, abandoned for centuries.

This floating cinema brings new meaning to the phrase "going out" to the movies.

This extremely narrow tenement boasts a maximum occupancy of just two.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A beautiful maze marks where three countries meet.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

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

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

Most prolific publishing house in the 1600s open to the public.

This deceptively salty lake looks like blushing pink lemonade.

Hundreds of tiny dead butterfly eyes gaze down at diners in this Australian eatery.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A psychological self-portrait in the form of a giant, segmented head.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.