These unknown Bronze Age earthworks are believed to be ancient burial mounds.

A beloved pet is buried in among the many old and famous residents of a Northern Ireland cemetery.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th-century.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

Step into Narnia at this small park featuring statues from "The Lion, the Witch, and the Wardrobe."

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

A museum marks and documents the site of the Titanic's launch.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The atmospheric road was never meant to be so creepy.

America’s oldest community theater, this Boston club has been in operation since 1877.

This historic Boston building has gone from personal estate to porn theater and back again.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

This decrepit abandoned building is made all the more eerie by its dark history.

The largest collection of historic military firearms in the United States.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

The famous facade of Grand Central Terminal hides a regulation tennis court, and it's not the first one.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.