At the southeast corner of Wesley and Main Streets in Wheaton, this Richardsonian Romanesque building began as the Adams Memorial Library, one of DuPage County’s first two libraries and Wheaton’s first public library. Funded by John Quincey Adams in memory of his wife, Marilla Phipps Adams, it opened in 1891 with more than 2,700 books and adopted the Dewey Decimal system early. The building served as the region’s main library until 1965, then reopened as the DuPage County Historical Museum in 1967. Since then, it has preserved and interpreted county history, and in 1981 it was listed on the National Register of Historic Places.