A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A derelict bit of transportation infrastructure hidden in the woods.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Home to items never before seen by the public.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Friction between grains of sand cause a curious "singing" sound.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A beautiful Victorian-era cemetery, complete with a miniature village.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

A son's promise to his dying father in the form of a covered bridge filled with thousands of seashells.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

A strange mark in the stone fence of a cemetery fabled to have been made by the Devil himself.

This 19th century granite fortification is one of the most well preserved forts in New England.

This Maine bridge may be the last wire-supported bridge of its type in the world.

Explore the dark underground corridors of this graffiti-covered former military fortification.

New England's tallest light house stands on an island with a history of cannibalism and death.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.