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

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

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

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

Over 120,000 curious objects that have shaped our modern world.

This abandoned prison castle has become an imposing gallery of graffiti art.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

This giant green head remembers one of America's jazz giants.