It reminded me of a bad single player Unreal level, then I realised there was some weird ass effects on the walls. I typed noclip, and all was explained - another LEAKED map :[ Building a box around a level to stop LEAKS doesn't stop the level from not vis'ing correctly, and its not very good for quality level design. (ie don't box ya map if it leaks! Its not hard to fine leaks in Q3Radiant)
A framey map set in some sort of castle. Its more of a beta than a full release.