San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

Singing sand that stands as the final remains of an ancient lake.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

An abandoned cyanide mill is now a haunting magnet for graffiti and illegal parties.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

Bits and pieces from the ill-fated Donner Party's winter cabins.

Home to the deepest rift anywhere on Earth.

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.

A smoke stack so large, the Washington Monument could fit inside!

The only road through the heart of Glacier National Park.

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

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

An entire town preserved as a historic landmark.

New fungal and bacterial species call this deadly lake home.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

This "floating island" plateau sits 7,671 feet above the forest floor.

This everlasting lightning storm may be the world's largest generator of ozone.

The Canaima airstrip in Venezuela keeps an antique DC 3 plane in its camp.

Shop the world's largest number of ice cream flavors, ranging from delightful to downright bizarre.

Dr. Farid Mattar's Monument of Peace.