This 12-seat movie theater is the smallest in the world.

A bizarre house filled with an astounding array of collections.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

Vermont's hills are alive with the sound of music at this historic hotel.

A 17th-century bezoar, dirt from an infamous site, and other curios decorate this unusual bar.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

A museum in the childhood house of a medical pioneer.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

Hiding the longest subterranean river known in the world.

This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

This German "living museum" is maybe a bit too immersive.

This residence straddles a border between Belgium and the Netherlands.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.