This psychedelic tourist trap is a leisurely descent into madness.

The once highest point in China blends symbolic design with a kick of adrenaline.

An out-of-place slice of France, smack in the middle of Shanghai.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

The site of the first "historically true" UFO encounter in the U.S.

A World War II-era submarine is stuck in the mud in New Jersey.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

A Medieval Water Tower in the Heart of Massachusetts.

An enormous, inside-out glass globe built in 1935.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This abandoned cemetery is crumbling into ruin, exposing the artifacts and bodies buried there.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

A mysterious spot where the laws of gravity seem not to apply.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.