Also the Mount Forest Island [0] in the Palos area of Chicago! This used to be an ancient island. It's also not far from Site A/Plot M Disposal Site [1] which contains buried radioactive waste from Chicago Pile 1/2/3 nuclear reactors and first home of Argonne National Laboratory [2].

[0] https://en.wikipedia.org/wiki/Palos_Forest_Preserves [1] https://en.wikipedia.org/wiki/Site_A [2] https://en.wikipedia.org/wiki/Argonne_National_Laboratory