Ride the subways of yesteryear.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

A crumbling hospital from the 1850s on Roosevelt Island.

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

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

Once a ferry dock, radio transmitter, and now a new Greenpoint park.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A modern addition to the Greenpoint skyline.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A hidden "place of interment for gentlemen."

Avoid gangster interaction while window-shopping.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A naturally mummified 2,000-year-old man.

Ship-sized kinetic sculptural fantasy.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Famously misunderstood wonder of the ancient world

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Pop culture has helped to keep this iconic British building from being destroyed.