A well-worn trail through thick woods in northern Montgomery County leads to an old schoolhouse.

This hidden treasure provides a charming access point along the south side of Baker Park.

The rock on which Moll Dyer was found frozen to death is said to still bear her handprint.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The smallest covered bridge in Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

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

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

A Civil War Museum with some notable medical antiques.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A museum dedicated to exhibiting remarkable outsider art.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A nostalgic bibliographic gem.

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

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

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

Lines from a walking song are etched into a rock in Natural Bridge State Park.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A museum dedicated to the alleged Roswell Incident.

An alternate history park where the Union Army loses the war... to dinosaurs.

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