One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

An eerie collection of the surviving structures from a past celebration of the future.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

An abandoned Depression-era zoo hidden just off the highway.

A small town in Rajasthan has been dubbed the "City of Stepwells," and Raniji ki Baori is the queen.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

This Minsk museum has cat coffee, cat chess, cat art, and even a cat "staff," which visitors are free to take home.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A rare particle accelerator with a tremendous energy range is tucked away at Ohio University.

This natural crater along the coast of Jersey may take its name from the devil statues who have watched over it.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

A gregarious Ohio resident has been building his whimsical temple to peace for decades.

A gorgeous gem on the ocean.

An alternate history park where the Union Army loses the war... to dinosaurs.

The world's first hotel built in an abandoned water-filled quarry.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Massive mounds of golden sand look like a desert landscape randomly plopped in an Arctic forest.

The eclectic seaside sanctuary caters to a rather fowl crowd.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.