Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

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.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.