A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

This poor little statue is the most vandalized memorial in Washington.

The world's oldest soul food restaurant is also one of its best.

A much-maligned monument to teetotalism.

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

This restored house is like a time capsule of the president's unconventional inauguration.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A rotating bridge that carries a little canal over a larger one.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

Go take a picture with the inventor of the daguerreotype photographic process.

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

The house where John Wilkes Booth conspired with his co-conspirators.

This small shop walked so America could run on Dunkin'.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.