Walk the whole Mississippi River!

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

Suburban observatory was personal lab of the father of modern astrophysics.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Giant granite rocks standing end-to-end like a train of circus elephants.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Erosion and time have created a naturally-formed water park.

A Bibliophile's Dream.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

The world's longest known cave system.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

A bit of retro transportation flair preserved in the world's largest department store.