The United States' oldest Episcopal church still in active use.

The only one-room schoolhouse remaining in Talbot County, Maryland.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This free, take-a-book shop seems like a trick but isn't.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Art deco landmark on the outskirts of Washington, D.C.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This statue honors the author's groundbreaking family story.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

A former major munitions plant that has been converted into a sprawling art space.

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

Outsider art meets paleontology at this roadside reptile repository.

This former asylum for Black Americans is haunted by its history of violence and racism.

Remnants of a storybook amusement park hidden behind a strip mall.

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

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

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

This historic lighthouse was well known for the large number of women who served as its keeper.

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

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Historic home of America's sweetheart sharpshooter, Annie Oakley.