Abandoned Arena is a map made for the Blocktopia Army of Darkness server, however it can also be adapted for any ol' server, too. It is a fairly basic map, with chests all around for loot/food, and the opportunity of mobs to become involved at night to make things a bit more interesting.

This is fully intended to be a PvP map, with the idea that players must search for their weapons and armor before they fight. How a server might want to handle that is entirely up to them, however. My main recommendation is that players are prevented from destroying/placing blocks, as they could easily break out of the map otherwise.

Aside from that, I'm pretty sure the pictures speak for themselves. Go ahead and download it, and enjoy! :)