These pretty kitties killed and ate as many as 135 railway workers.

The palatial McDonald's that inspired Wesley Willis.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

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

A terrific purveyor of natural history objects and curios.

Walk over a 150 year old manhole.

The greatest real estate coup of all time.

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

Walk into the 19th century without leaving Brooklyn.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Detailed facade of a brownstone in Boerum Hill.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Ride the subways of yesteryear.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

While it now takes more than a dime to open an account this historic Brooklyn bank still displays the opulence of the gilded age in which it was built.

A modern zoetrope on the New York City subway.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A fitting attraction for the corn capital of the world.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A smoke stack so large, the Washington Monument could fit inside!

New fungal and bacterial species call this deadly lake home.