This abandoned prison castle has become an imposing gallery of graffiti art.

A sculpture of a giant man escaping from the depths of the Earth.

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

The world's largest man-made underground caverns offer unparalleled underwater wonders.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

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

A mysterious light of unknown origin on the backroads of Missouri.

A Civil War Museum with some notable medical antiques.

This impressive Boston holy house is the American mecca for Christian scientists.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

This landmark cemetery in Boston was created more than 300 years ago.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The site of Paul Revere's historic two lantern warning.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Museum dedicated to awful artwork.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

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

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.