The kind of mixed-up place that drives archaeologists crazy.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

"A hideous albatross in the Hudson River Valley."

Mansion and shopping center used in the 1975 film "The Stepford Wives."

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

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Harlem park dedicated to compulsive hoarders killed by their own junk.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Oldest surviving example of a Dutch saltbox frame house in America.

Con Edison’s exotic and heat-loving pests.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

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

A crumbling hospital from the 1850s on Roosevelt Island.

19th century cemetery hidden in Brooklyn's Prospect Park.

Townhouse facade doubles as an RMS Titanic Memorial.

Four cars from the old system were once on display, but were removed in 2014.

Where Greenpoint's first European settler—and troublemaker—made his home.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

An artist's cute bronze subway sculptures belie his violent artistic past.

This innocent-looking townhome is actually a subway exit.

A hidden "place of interment for gentlemen."

A dilapidated dock tells the story of Titanic's missed arrival.