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

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.

Washington's iconic carousel has a nice piece of Civil Rights history.

It was once the base for a series of domestic terror attacks.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Home to items never before seen by the public.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The land is home to swimming ponies and a legendary 18th-century treasure.

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

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