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

"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!”

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

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

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

This park pays homage to the region's rich industrial history of brick making.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

Just outside the Ohio Supreme Court sits a testament to justice.

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

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

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.