One of the most interesting and educational places...

One of the most interesting and educational places I've been to recently. They have: an impressive solar array (44.4 kW), tiered compost, rain collection and filtration, water table friendly construction, recycled materials utilized everywhere, a small native animal museum, classrooms, gardening, a rooftop bee colony, citizen science programs, volunteer opportunities, summer camps, an observation tower / climbing wall, yard equipment rentals, boat rentals (it's built right next to the Milwaukee River), and more I can't remember offhand. Free parking.