Mills Mansion State Historic Site
Old Post Rd., Staatsburg, NY 12580. 889-8851. The country home of Ogden and Ruth Livingston Mills, built in 1895-96 and furnished in the styles of Louis XIV, Louis XV and Louis XVI. Open Apr. 1-Labor Day, Wed.-Sat., 10am-5pm, Sun. 12-5pm. Open Labor Day-late Oct., Wed.-Sun., 12-5 pm. Special Christmas tours, call for hours. A, G, H, T

Montgomery Place
River Road, Rte. 103, Annandale-on- Hudson, NY 12504. 758-5461. 434 acre Livingston family estate with restored 23-room mansion and gardens, waterfall, walking trails, special events, views of the Hudson River and Catskill Mountains. Open Apr.-Oct., Wed.-Mon., 10am- 5pm; weekends in Nov., 10am-4:30pm; first 2 weekends in Dec., 12-5pm. Outdoor tented weddings available.

Museum of Rhinebeck History
PO Box 816, Rte. 9, Rhinebeck, NY 12572. 876-4902. Located at the 1798 Quitman House. Local history exhibits Jun. -Oct., Sat.-Sun., 2-4pm; Wed. by appt.

Old Rhinebeck Aerodrome Museum
44 Stone Church Rd., Rhinebeck, NY 12572. 758- 8610. Antique aircraft and automobiles on display and in action, air museums. Open May 15-Oct. 31, 7 days, 10am- 5pm. Weekend airshows, mid-Jun. thru mid- Oct., 2:30pm. Open cockpit bi-plane rides available before and after shows.

Franklin D. Roosevelt Library and Museum
Route 9, Hyde Park, NY 12538. 800-FDR-VISIT. Contains extensive displays on the lives and careers of Franklin and Eleanor Roosevelt and exciting interactive exhibits. The museum is open 7 days, Apr.-Oct. 9am-6pm, Nov.-Mar. 9am-5pm. Closed Thanksgiving, Christmas and New Year’s Day. Research library is open Mon.-Fri., 8:45am-5pm. A

Samuel F. B. Morse Historic Site — Locust Grove
PO Box 1649, 370 South Rd., Route 9, Poughkeepsie, NY 12601. 454-4500. Home of Samuel F. B. Morse, designed by A.J. Davis. Extensive furniture collection, china, art, telegraph exhibits, gardens, nature walk. Open 7 days, May-Nov., 10am-4pm; Dec., Mar., Apr., 10am-4pm by appt.

Olana
Rte. 9G, Hudson, New York (518) 828-0135 . Hudson River artist Frederick Church's Moorish mansion. Mansion tours, scenic walks. Hours: Open May through October, Wednesday through Saturday, 10 a.m. to 4 p.m.; Sunday, noon to 4 p.m.

Vanderbilt Mansion National Historic Site
c/o National Park Service, 519 Albany Post Rd., Hyde Park, NY 12538. 229-9115. Located on Rte. 9. Home of Frederick and Louise Vanderbilt, built between 1896 and 1898, representative of the “Gilded Age.” Grounds, trails, formal gardens and a spectacular view of the Hudson River. Open 7 days. 9am-5pm.

Wilderstein Preservation
PO Box 383, Morton Rd., Rhinebeck, NY 12572. 876-4818. 1888 Victorian home of three generations of the Suckley family, descendants of the Beekmans and Livingstons. Grounds designed in the American Romantic Landscape style by Calvert Vaux. Interiors and windows by J.B.Tiffany. Walking trails and views of the Hudson River, May-Oct., Thurs.-Sun., noon-4pm. Weekends Thanksgiving-Dec. 1-4pm.