The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A son-and-daughter meat market, hawked by mom and dad.

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.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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.

The world's tallest ferris wheel 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.

A futuristic airport terminal built in the 1960s, abandoned for years, and soon to be reopened as a hotel.

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.