This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

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

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

During World War II, this rice mill became a Nazi concentration camp.

The phone booths of New York City have all but disappeared, but their remains were once found in this "graveyard," sadly now removed as well.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This massive underground salt mine now holds a sci-fi theme park in its depths.

After this one-of-a-kind palace was built the architect's hands are said to have been cut off to keep it that way.

California's own majestic geyser is powered by a subterranean volcano.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

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

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

The gutted remains of this Estonian mansion are a monument to a tragic love.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

The highest tropical mountain range in the world is in Central Peru, home to a vast array of exotic and quirky plants and animals.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

A communal oasis on Lake Zurich.

A high point in Vancouver kitsch.