This surreptitious shop is only open five hours per week.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Visible below the waves are memorials to the city's Gold Rush dead.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A huge musical instrument played by the ocean.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Hot springs monkey spa in the middle of Hell's Valley.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

Over one million bird-related artifacts await.

The ruins of the castle that chemicals built.

Medicinal spa created with the discharge from a geothermal energy plant.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

Climb right into the heart of this colorful Iceland volcano.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

The largest whale museum in Europe allows visitors to walk among life-size giants.

An encyclopedic collection of mammal penises.

Staves, storm-calling, and of course, necropants.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.