A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

This mysterious marker puzzles pedestrians and infuriates geographers.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

The hometown of movie legend, military officer and All-American guy next door, honors this great actor.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

This park contains a number of standing stones meant to heal and inspire.

A sprawling maze of used books piled from floor to ceiling.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

A monument celebrating the idea of reaching inaccessible places.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

The final resting place of the world's first nuclear reactor.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

In Paris, Texas they have their own Eiffel Tower, it just has a cowboy hat on it.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

A whopping 14,000 copper coins cover this miniature fighter jet.

One of the last active volcanoes on the Eastern seaboard.

"The Most Boring Road in the State."