Hours: Mon.-Sat. 10-5:30, Sun. 1-5:30, Memorial Day-Labor Day; Mon.-Sat. 10-4:30, Sun. 1-4:30, Feb. 1-day before Memorial Day and day after Labor Day-Dec. 30; closed Jan. 1, Easter, Derby Day (first Sat. in May), Thanksgiving, Christmas Eve, Christmas and Dec. 31. Guided tours are given daily on the quarter hour; last tour 75 minutes before closing.