This grand stone tower was dedicated to a famed American humorist almost by coincidence.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Fuel your honky-tonking with this venue's unbeatable “Recession Special.”

The world's longest known cave system.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This church houses the “incorrupt” body of its founding Bishop.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.