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

This abandoned amusement park was built on a site with a dark history.

The rocks in this arid basin leave trails of movement behind them.

The first declared National Monument in the United States.

This shop for all your super spy needs hides an educational secret.

Home of an evil witch famous within southern folklore.

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

Enormous lake at the bottom of a unique cave system.

America's most famous piece of self-built architecture.

A house carved into a rock in the 1940s.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A giant Troll lurks under one of Seattle's oldest bridges.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The legendary building that needed ghostly approval before being built.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A psychedelic labyrinth on the San Francisco bay.

This beautifully deceptive waterfall is something far different from what it appears to be.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.