The first museum in the United States dedicated entirely to posters.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The resting place of a Civil War celebrity's amputated limb.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

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

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

The former hotel where Tesla invented the radio.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A hidden "place of interment for gentlemen."

Step inside Lucy, the world's largest "elephant."

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

Unrepaired walls from a 1920 anarchist bomb attack.