That's most peoples' experience as well, I think. Standard procedure is to let the world define the types of adventures which are possible (and, more importantly, aren't possible) within it's bounds.Ironically, published adventure modules tend to take more effort to fit into my campaign than adventures I develop completely on my own...
If you don't mind some pre-campaign reading of multiple Dungeon magazine adventures and building your world to meet their needs for props, it's possible to reverse the situation, and have your worldbuilding become thrall to the needs of your adventures, rather than your choice of adventures become thrall to the needs of your worldbuilding.
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