The Ages of 1 Million New York Buildings, Mapped in Explosive Color

If you were to splash New York with some kind of luminescent ink that reveals the age of buildings, this is roughly what it would look like: vast green swaths of 20th-century development, freckled with verdant blue and purple structures slapped together in the 1800s:

This incredible view of one of America's oldest burgs – available for your time-wasting pleasure here – was conjured over two days by Brandon Liu, a 24-year-old computer programmer in San Francisco. Inspired by similar visualizations for Brooklyn and Portland, Liu took a bulging wad of newly accessible open data and used it to create an extremely detailed, color-coded cartography of 1,053,713 buildings. Mauve dates to the 1830s, medium blue the turn of the century, and yellow the mid-1990s. It's zoomable, so you can ratchet down to specific neighborhoods to root out some real geezers hiding among all the fresh-faced facades.