These aggressively sustainable art homes look like something out of 1970's science fiction.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

One of the most unusual geological features, recognizable from a dozen hit movies.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

A controversial memorial at the place where Captain Cook met his violent end.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.