The vast, legendary catacombs hold secrets much stranger than stacked bones.

Famously misunderstood wonder of the ancient world

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

360° views of the city plus five floors of optical illusions and hands-on science.

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

A 120-year oil leak slowly unleashes more gallons of oil than the Exxon/Mobil disaster.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Neoclassical bank designed by NY architects Helmle & Huberty.

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

Known as the "Forgotten City" it was home to industry, riots, artists, squatters, and to one of the largest single disaster fires in New York City.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

Little Red Lighthouse under the George Washington Bridge.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

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

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

A Natural History and Science Emporium.

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

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

A terrific purveyor of natural history objects and curios.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.