The construction of a tram line unveiled hidden remnants of the old medieval city.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

A beautiful discovery site of prehistoric burials.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

Fans of the spicy bright-red sauce can tour where it's made.

Ancient human, animal, and geometric figures drawn in the earth.

Where NASA's satellites and rovers phone home.

Decommissioned experimental solar facilities that pioneered solar energy technology.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

A former utopian healing center created by a huckster and built by derelicts.

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

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

The most isolated mailbox in America lets desert travelers record their passing.

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

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

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

Dramatic river bend surrounds a natural red-rocked pedestal.