
Battle for Icecrown
Battle for Icecrown is another "old school" classic. It was notably selected by Blizzard as one of their spotlight maps, and is the only AoS I'm aware of to date which explored implementing a dynamic terrain.
Rather than the usual river and pair of opposing towers, the middle lane in Icecrown sports six large platforms which periodically raise and lower, changing the layout of the lane. Despite sounding complicated, it's really just switching between two configurations every minute, but this has some interesting consequences for gameplay.