Copenhagen's celebrated theme park and gardens.

Turnip-shaped island just off the Michigan shore in Lake Huron.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

A perfect turquoise lake colored with glacier dust.

Legend holds eating just one of these black eggs can add seven years to one's life.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Commonly referred to as the most photographed Victorian home in the United States.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

The ruins of the castle that chemicals built.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

A student driver's nightmare.

Amsterdam's Red Light District leaves little to the imagination.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

The longest navigable underground river in the United States is home to countless blind and albino animals.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

2300-year-old Roman road connecting the empire.