Aliens vs Predator 2 singleplayer custom map titled "Rod Serling's Giant Infested Scrotum Hangs Heavilly Over The Sacrificial Altar of Stonehenge" aka "Scrotumhenge".
Map author: Windebieste
This is another skirmish map from the twisted mind of Windebieste, who claims he had the flu when he came up with the idea for this map. It's a circular map with respawning aliens chasing you. You can climb up the ladder to the stone platforms for some cover, but occasionally aliens will drop down on your head. Overall, this is a small but funny skirmish map.