Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Visit the monolithic tomb of America's most famous general.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

The first "Hall of Fame" in America was designed by legendary Gilded Age architect Stanford White for what was then the NYU uptown campus.

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 home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Europe's largest prehistoric mound – burial site of a legendary king?

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

The oldest stone house in Paris was built by its most famous alchemist.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Amsterdam's Red Light District leaves little to the imagination.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.