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

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

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

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

This pharmacist and his patient greet visitors to the National Community Pharmacists Association.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This mundane post marks the old location of the city's main postal hub.

The unexpected mascot of Shetland's capital.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

The oldest playground in America.

Friction between grains of sand cause a curious "singing" sound.

A tiny monument to the classic American candy.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

One car at a time please.