The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

The Decoy Capital of the World.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

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

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

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 United States' oldest Episcopal church still in active use.

One of the only memorials dedicated to journalists who died in combat.

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.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

This 1830s store is believed to be the site of Harriet Tubman's first stand.