This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A self-built castle made by a mysterious man.

A museum and tribute to a brave profession.

The unusual burial monument of Arizona's first governor.

A spiritual vortex among the red rocks in Sedona.

A mysterious "wedding cake" castle in the middle of the urban desert.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

A geological mystery on Camelback Mountain.

A towering bronze statue memorializes the founding father of postwar American conservatism.

An urban laboratory.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

See the sky in a new way through this art installation.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

A modernist landscape of water and sci-fi concrete.

Belly up to the bar in Cowtown, don't forget to buy some boots.

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

An amazing clockwork museum in the Val de Travers holds examples of various prestigious legacies horological history.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

These magnificent 240-year-old machines are considered distant ancestors of the computer.

150-year-old satirical tableaus made from stuffed frogs.

Swiss vineyards in a UNESCO heritage site.