This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

A curious friendship between two inanimate ladies.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

The longest covered bridge in Delaware.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

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

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

The site of the climactic scene from the classic horror film is now a historic landmark.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

FDR's Art Deco hospital tower was hopelessly inefficient.

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

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

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