What is with Rocky Mountain Arsenal Wildlife area near Aurora?

Located just northeast of Denver, the Rocky Mountain Arsenal National Wildlife Refuge, approximately a 15,000-acre expanse of shorgrass prairie, has survived the test of time and transitioned from farmland, to war-time manufacturing site, to wildlife sanctuary. It may be one of the finest conservation success stories in history and a place where wildlife thrives. A place where visitors reconnect with nature and experience the many opportunities the Refuge has to offer.
You can check out there web site to find all the details. http://www.fws.gov/rockymountainarsenal/

If I'm not mistaken, it's one of the largest urban areas used for a refuge in the states. I've only been there once myself, but it is worth a visit, especially if you enjoy the outdoors and being around nature.