Hello from Paulding Co. (but right on the Cobb County line). Lots of places to hunt in Marietta. If you're new and you don't want to bother with having to get permission for private property hunts try some of the city/county schools and parks. Other than the Square (which would be a detectorist's dream), I think you're pretty safe. With the schools closed this month, it's also a good time, though I would do the early morning because of the heat. Just stay away from any manicured playing fields and replace your plugs like you were never there and no one will bother you. I do most of my school/park hunting in Cobb and Bartow because Paulding doesn't allow detecting in their parks.