This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Exact replica of the ancient monument, but much, much lighter.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

Outsider art meets paleontology at this roadside reptile repository.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

The sign to a demolished amusement park now stands in front of a local library.

Abraham Lincoln's likeness rests at the top of this giant totem pole.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

The famous Beatle secretly visited this Illinois town several times to visit his sister.

This odd stone memorial remembers a loyal dog who offended the rail barons with his speed and saved his master with his pee.

This simple gravestone remembers a pig who single-hoofedly raised $19,000,000 for the Navy.

A former atom smasher turned into an art gallery.

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

The world's largest covered wagon is piloted by a giant Lincoln lawyer.

The only place in America where anyone who wants can shovel coal aboard an antique train.

The murals have transformed a residential alley into a vibrant drive-through gallery.