The small burial plot is located in a mall parking lot.

Fossilized sea bottom and lime quarry.

This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

This 220-year-old house is a reminder of New York City's Dutch past.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

The only surviving sidewalk clock in Brooklyn.

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

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

One of only two commuter aerial tramways in the United States.

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A crumbling hospital from the 1850s on Roosevelt Island.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The boulder on which Alexander Hamilton laid his head after a deadly duel can still be visited on the New Jersey coast.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This historic club for wayward boys has shaped some of the biggest names in music almost as much as they have shaped it.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

The blinking light atop the iconic landmark has been sending secret messages for decades.