An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

An eerie, derelict amusement park in Berlin.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Macabre astrological automaton clock dating to the late 1400s.

An exquisite tunnel of cascading flowers.

A swing to dangle you off the very edge.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Rippling sand dunes frozen in the Arizona rock.

A magical place that lets you play in and explore the world of Studio Ghibli.

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

A huge musical instrument played by the ocean.

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

The ghostly remains of an accidental sea.

A museum dedicated to a sea that should have never been.

Along a California highway is a kind of Jurassic Park made of metal.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

Light still pours into the ruins of this ancient Islamic observatory.

A neutrino detector built into the largest man-made underground cavity in the world.

A large sculptural artwork and garden in Escondido, California.

This large collection of tiny things revels in the art of fine machinery well made.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.