There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The towering figures were created from the cemetery's fallen old-growth trees.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

Home to a vast and influential collection of Shakespeareana.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

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

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.