There's been a lot of cool pieces of chalk artwork, but I haven't seen any in the past quite this detailed. It's incredible... the amount of planning that must go into these has got to be intense.
http://io9.com/5159210/little-towns-consumed-by-lava-flows-and-crumbling-glaciers
http://io9.com/5159210/little-towns-consumed-by-lava-flows-and-crumbling-glaciers