The last bastion of Roman presence north of the Alps looms over a German town.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Curiously, this large sporting goods store features 14 wax representations of American presidents.

The colossal cartoon man stands outside a Nevada museum.

This former New Jersey bus now exists as a public art exhibit.

An iconic 1960s theater with a Buckminster Fuller-style geodesic dome.

This 18-foot-tall steel lotus is a meditation on ecological crisis that originally appeared at Burning Man.

A concrete arrow from a 1920s network of airmail beacons is still preserved at the western edge of suburban Reno.

This wilderness hike to a waterfall has an unlikely beginning in suburban Reno.

The arch that celebrated the completion of the Lincoln and Victory highways.

Bill Murray bowled three straight strikes here at Reno's "Taj Mahal of Tenpins."

An eccentric millionaire's personal curio collection includes at least one shrunken head.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

The quintessential Japanese rock garden has existed for more than 500 years.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The ancient latrines of the Greeks, in all their public glory.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.