de_sacrelige is already the most popular map I've made. It was featured on the front page of CS-Nation when released, as well as a few other prominent CS sites.
Like most of my maps, this has a lot of vertical gameplay along with horizontal (so you are looking up and down as much as left and right).
While there is only one actual bombsite, it is situated at the top of an ancient temple such that it can be planted on the roof or the floor right below.
While small, the layout is complex enough to give the Terrorists many routes to the bombsite.