This tower was once used to create ammunition for early settlers.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

These curious caverns have been home to mushrooms, gangsters, and disco.

Ever wanted to can Spam?

World's largest Christmas store.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

The world's largest fully steerable radio telescope.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

America's post-nuclear-attack chambers of Congress.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This collection honors the iconic, and proudly American lighter that just won't quit.

"Where the ducks walk on fish."

A throwback train ride transports passengers through one of the lesser-known national parks in the country.