First Amplified SMP
This server started with the introduction of an amplified world type for Minecraft. Challenges were introduced that required creativity to overcome. Bases took new forms, new transportation methods were explored and boundaries were pushed. This server stayed up to date with Minecraft snapshots, including the temporary change to minecarts allowing them to fly off the rails. The map features a rainbow bridge, a hole to bedrock at spawn, and a penis-shaped base.
See the wiki page for this server for more details.