Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A giant 400-acre preserve in North Florida for displaced wolves.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

The highest point in Texas is capped by a big silver pyramid.

World's largest precision optical instrument used to detect Einstein's elusive gravity waves.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

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