In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

A sulfuric martian landscape that looks far better than it smells.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Ancient snack bar of the Roman Empire re-opened.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

"A hideous albatross in the Hudson River Valley."

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

A Natural History and Science Emporium.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Home of Jake the Alligator Man, the mummified remains of a cigar smoking, cross-dressing celebrity of the Northwestern coast.

An obscure waterfall that looks like something out of a fantasy novel.

A home made entirely from scrapped, reclaimed and recycled material in Whitman County, Washington.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

One of only two commuter aerial tramways in the United States.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A white oak with property rights.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Mysterious 500-year-old tapestries depict a unicorn hunt.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.