The map above, by Nik Freeman of Mapsbynik, shows the 4.9 million census blocks in the U.S. (out of 11.1 million in total) with a recorded population of zero. It's a pretty gorgeous creation, and it pairs nicely with an older favorite of mine, from the US GSA:

Mapsbynik is the same guy who made this Waffle House density map, so he has a pretty good highbrow-lowbrow thing going here. Let's hope for more great maps in the future.