A second generation sun-powered marvel lights up the night.

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

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The site of the climactic scene from the classic horror film is now a historic landmark.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

This secluded walking trail is a hidden gem of a Pittsburgh park.

The walls and streets of the ancient city are peppered with penises.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.

A marvel of Byzantine engineering under the streets of Istanbul.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.