A historic neighborhood church is reborn as a psychedelic arts collective.

This lovely pocket park is one of the most under appreciated in D.C.

The U.S. Fish Commission’s effort to mass produce carp.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

People escaping slavery may have hidden inside a corpse vault.

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

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

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

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

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

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

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

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.