Countless stories attempt to explain Poland's mysterious J-shaped trees.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Ruins of a Carnegie family mansion on Cumberland Island.

This modern monument to pagan belief looks like it was transported straight from ancient times.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

One of Ireland's most infamous prisons for rebels including men, women and children.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

A modern English garden of eccentric beasts, follies, and oddities.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

A small flooded ghost town with a few scattered structures remaining.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Half of a waterfall goes into the river while the other half seems to disappear.

The Magical World of George Phar Legler.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.