The highest point in Delaware is located under a trailer so this marker across the street will have to do.

A museum dedicated exclusively to aircraft used in the military.

This tree is a living witness to the beginning of the Civil Rights Movement.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

America's first federal monument.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The land is home to swimming ponies and a legendary 18th-century treasure.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

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

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.