Cannon designed to fire an atomic warhead.

Who knew the Devil's domain was a hot spot for tubing?

The final resting place of the Seminole Indian chief who fought against government occupation in Florida.

The ill-fated plan to reroute the Mississippi so that Union ships could bypass Confederate fortifications on the river bend.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

An abandoned factory along the Mississippi coated by a giant mural.

Visit the monolithic tomb of America's most famous general.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

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

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

The massive machine creates cracking displays of indoor lightning.

An easy-to-miss plaque marks the building that first held this 19th-century telephone innovation.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

This tribute to the founding father of the American dictionary originally contained a spelling error.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The world's largest piece of copyrighted artwork.