I plan to use my MPR blog to share some of those places. Last year we took a day trip to Kentucky Camp, an old gold mining town located in the Santa Rita Mountains.
The drive is quite scenic and only about an hour from Tucson. Take Highway 89 (the road to Sonoita) to the Gardner Canyon turn-off. Once you turn, you have about 5 miles of gravel road to travel. The road forks, so be sure to follow the signs to Kentucky Camp. The road is dirt but in decent shape. If you take a car, you may want to hike the last mile in, but a regular pick-up or SUV should be able to make it all the way without a problem. There are several old adobe building and some old mining equipment around to look at. The area is beautiful terrain with lots of scrub oak. A nice break from the desert.
The forest service is doing some restoration and even has a small cabin on-sight available for rental. It is rustic - look close at the sign below, "Bed and No Breakfast Inn".
There are not many ghost towns open to the public that are in as good shape as Kentucky Camp. You can wander around at will. The area is open range so expect to see some cattle. Pack a picnic, or head down to Sonoita for lunch. You will not be disappointed.
For more information on Kentucky Camp and the forest service cabin rental check out the links below:
Wikipedia -Kentucky Camp Arizona
Coronado Forest Heritage Rentals