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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This frequently-photographed waterfall takes only a short hike to visit.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A beautiful geyser under environmental threat.

The rocks in this arid basin leave trails of movement behind them.

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

The first declared National Monument in the United States.

A museum dedicated to the history and exploration of both popular music and science fiction.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Mysterious rocks that ring musically when struck.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Dramatic river bend surrounds a natural red-rocked pedestal.

On the Oregon coast there is a natural hole that seems to be draining the sea.

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

Inside a state forest, the forgotten remains of a Cold War defensive installation.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

The cave where two British judges hid in exile after sentencing the king to death.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.