City 17 in ruins, with that cool color and debris the decaying tower gives off is one of the best looking levels Ive ever played through.
Im sad to say the source engine is looking a wee bit dated from what Ive seen of EP2, but the system they put in for the destruction of large set pieces looks stunning. I just hope they are dynamic, and not pre scripted. Valve has the best artists this side of Blizzard, so Im sure the game will be looking good no matter the technical limitations of the engine.