Why have you never heard of the second most popular tourist site in New York?

A curious friendship between two inanimate ladies.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A modern zoetrope on the New York City subway.

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

Neoclassical bank designed by NY architects Helmle & Huberty.

The competition: breathe deeply as long as you can.

A terrific purveyor of natural history objects and curios.

A notorious punk house turned co-op.

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

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Copenhagen's celebrated theme park and gardens.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

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

Yale University's home for rare works, including the mysterious Voynich Manuscript.

Connecticut sites linked to the only trial to ever use demonic possession as a criminal defense.

New Preston and Kent, Connecticut - where Friday the 13th, Part 2 was filmed.