The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This 19th-century church is now a popular roller rink.

An incredible airplane graveyard sits outside this small museum dedicated to preserving aviation history.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A lakeside garden in the Southern Alps full of whimsical artwork and thousands of beautiful flowers.

A moody and picturesque riverside ruin overgrown with vegetation.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

Southern Italy's spinning top village.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

These nearly 500-year-old scenes are largely faded by the ravages of time, yet still maintain their power to horrify.

A former hospital is now home to a pizza parlor and maybe a few ghosts.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

No matter how many times this community-run sauna gets destroyed, it always rises from the ashes.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

This tiny store is your one-stop shop for all sorts of rare and wonderful buttons.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Enormous statue of the Emperor of the Mongols.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A fantastical bed and breakfast with magically unique rooms.

Shells collected from over a hundred different countries line the walls, floors and ceilings of this fantasy museum.

Experience park where visitors are told to expect the unexpected.

Located outside Medellín, this Colombian park focuses on conservation and sustainability.