Texas Subcategories This category has the following 7 subcategories, out of 7 total. Educational buildings in Chicago (4 C, 1 P)A Astronomical observatories in Illinois (11 P)L Libraries in Illinois (5 C, 10 P)M Museums in Illinois (28 C, 3 P)N Educational buildings on the National Register of Historic Places in Illinois (3 C, 1 P)S Schools in Illinois (16 C)U University and college buildings in Illinois (5 C)