Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

The school tested mustard gas for the U.S. Army during World War I.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

Every drop of D.C. tap water flows through this old waterworks.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

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

This abandoned Victorian-style house was built in 1884.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

This forgotten boat elevator was an engineering marvel in its heyday.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

This nine-story building is the oldest standing skyscraper in D.C.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The district's only illusionarium supports free writing programs for local students with every purchase.

This unassuming passageway played a key role in one of the most important events in U.S. history.