The folks over at AddressReport have made a map that visualizes every building demolition in Manhattan from 2003 to 2014. The places with the most action? Looks to besurpriseNoMad and the far west side, although it's truly hard to tell. The site is putting out Brooklyn and Queens animated maps soon, too.
· Every Demolition in Manhattan Since 2003 [AddressReport]
· Cool Map Thing archives [Curbed]