Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

The Underground Railroad passed right through this historic Brooklyn Heights church.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

A reminder to choose water over wine since 1888.

The highest point on the island known for buildings that touch the sky.

A Manhattan office building is home to the world's largest chess board.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

Wine bottle sculpture with a ship's stateroom inside.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A celebration of capitalism in Midtown.

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

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The anatomical-pathological collection of a man who changed surgery.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

An unassuming London park is actually a pilgrimage site for modern clowns.