A quiet and contemplative oasis in the middle of New York's bustle and riot.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The most confusing clock in New York.

This semi-hidden Manhattan restaurant is based out of a loading dock.

The 28-foot granite map plots the locations of 40 theaters in New York City.

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

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

Elevated freight railway turned wildly successful urban park.

A dilapidated dock tells the story of Titanic's missed arrival.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.