The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A super-sized promotional trick that is now a D.C. landmark.

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

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

Hiroshima survivor on Riverside Drive.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Largest Roman Catholic church in North America.

The oldest continuously operating fish market in the United States.

The national park was once a plantation estate.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Little Red Lighthouse under the George Washington Bridge.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

An artist's cute bronze subway sculptures belie his violent artistic past.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

The blinking light atop the iconic landmark has been sending secret messages for decades.

A collection of artifacts from Maryland's maritime past.

A museum dedicated to exhibiting remarkable outsider art.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

One of the best examples of Art Deco architecture in the United States.