Very nice set, I especially liked the tiles that have the interiors of the mausoleums showing - this bodes well for the prospect of any future boat/village/city etc sets coming up (soon, he said hopefully!).
The one tomb that has the stairs leading down to (presumably) a dungeon of some sort is especially nice. I can see that one leading to a dungeon with some of the tiles from the Dungeon Details set, perhaps combined with the Crypt of Blood and/or the Cave/Dungeon links to expand even further into an underground cavern. The possibilities are endless :)