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

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

One of the oldest living oak trees in the Southeast.

A bizarre roadside attraction and the first instance of miniature golf in the world.

See massive fossils that are over 200 million years old in northeastern Arizona.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Quite simply the largest tree in the world (by volume).

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

San Francisco's newly reopened hands-on science museum.

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.

Elevated freight railway turned wildly successful urban park.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

A bizarre house filled with an astounding array of collections.

A glowing underwater cliff attracts marine life and divers in equal measure.

Send a postcard while vacationing with Satan.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A Roman-style column in Oregon hides a spiral staircase inside.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A massive sea stack famous for its appearance in The Goonies.

100-year-old shipwreck you can walk up to at low tide.