Darod,
Florida is chock full of treasures like that. It's probably the best state in the country for MDing coins. The beaches are full of stuff. Spanish gold coins are littered along the florida coastlines, and florida has some very old towns. St. Augustine is very old. St. Peretsburgh (where I'm originally from) is old. Miami, the keys, etc...There are lots of old places in Florida. What part of Florida are you in? There are quite a few ghost towns in Florida too.