While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

The "lovely red Vega" of the legendary record-settling pilot.

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The walls of the iconic dome are hollow and have a secret stairway.

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

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

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

A quirky Poe-themed joint on an island keen to celebrate its overlooked connection to the famous writer.

Paths are maintained, but trees have taken over plots.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Performers, intricate sets, and a real speakeasy tell the story of the 18th Amendment.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

A natural history museum with an extensive collection of bird dioramas.

This 1,500-acre development hopes to be the Central Park of the South.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

A collection of huge Pre-Colombian structures in Alabama.

A unique book shop with a collection of rare tomes and a nostalgia museum.