The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

An architect's childhood fantasy treehouse made real.

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

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

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Yo, Adrian!

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

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

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This private residence was the template for one of the most beloved television homes of all time.

World-famous, Pink's still manages to keep its prized cult fetish status.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The homestead of American patriot John Adams.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.