The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

Holding the most bodies of any cemetery in the United States.

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.

Unique antiquarian shop specializing in globes, maps, and prints.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Tucked in the back of this amazing antique store is an important piece of medical history.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

"Try not to knock anything over!"

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The largest stone moai on Rapa Nui.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A Romanian church built from one single oak.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

A giant portrait of an ancient king looms over the river.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."