Within the historic district, four 18th-century historic sites have been managed by the "Washington Heritage Museums": the Mary Washington House, where George Washington's mother lived in her final years; the late 18th-century Rising Sun Tavern, and the Hugh Mercer Apothecary Shop (the fourth, the St. James House (built 1768), is open to the public only during Historic Garden Week). Important public buildings include the 1852 courthouse designed by James Renwick, whose works include the Smithsonian Institution's castle building in Washington and St. Patrick's Cathedral in New York City, and the 1816 town hall and market house, now operated as the Fredericksburg Area Museum and Cultural Center. Another site of interest is St. George's Church. The James Monroe Museum and Memorial Library is located on the site where Monroe practiced law from 1786 to 1788. The museum is housed in a building made up of three individual structures, constructed at different times, beginning in 1816.