Board Thread:Questions and Answers/@comment-66.253.146.29-20170104060208/@comment-25949271-20170223205354

You are able to find them in survival without cheating them in, you can find them in Dig Sites and in Aztec Weapon Shops. However, those structures are pretty hard to find although every world should have them if you look long enough. If you want to cheat them in without going into creative you'll need to use the mod NEI (not enough items).