This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

One of the best places to see wild Colonial Spanish Mustangs in the United States.

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

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

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

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

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

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

The most decorated dog of World War I is preserved in the Smithsonian.

Washington's iconic carousel has a nice piece of Civil Rights history.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Three hundred years of preserved Spanish colonial history in San Antonio.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A building so large that it has its own weather.

The world's largest anatomically accurate brain sculpture.

Low-frequency noise compared to an idling train can only be heard by some of this industrial town's residents.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A 131-year-old wunderkammer of Texas history.