This advertisement for talcum powder was painted on the rock face and has since defied removal.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

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

The world's largest fully steerable radio telescope.

This old-fashioned carhop restaurant gave the world the waffle cone.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

The narrowest house in America is seven feet of pure spite.

A nostalgic bibliographic gem.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

Outsider art meets paleontology at this roadside reptile repository.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

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

The Cadillac Ranch for monster truck aficionados.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

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

A small Richmond island dotted with the remnants of hundreds of years of history.