A lush green oasis in the middle of Chicago.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A cemetery housing wild west legends in South Dakota.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Just a man taking his prehistoric pet for a stroll.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

The ruins of the castle that chemicals built.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Even in death, he's still your huckleberry.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.