Spawn is the area at which new players appear upon arrival to the server. In most servers, spawn is also where players might respawn on death, but for purposes of this server that is not applicable. New players get Campfire PvP Protection to give them a chance to leave Spawn without being set upon by Spawn killers, but must use this wisely and still be very careful.
A new player in the original World 1 tunnel under the desert at Spawn.
World 2 Spawn
World 3 Spawn
World 4 Spawn
World 5 Spawn - Internal view
World 6 Spawn - View from above
World 6 Spawn - View from below
World 7 Spawn - View From Swords
Starting from the middle of World 1, when Spawn was moved to a new location to alleviate resource depletion, Nether Gates were included in all Spawn buildings. Regularly, the Nether Spawn Area is also protected, with PvP disabled.
Here are some of the Nether Spawns that have featured on HCSMP.