Explore this elegant Jacobean Revival-style mansion built during the Gilded Age. The 28-room estate is set on more than 11 acres, and it was the summer home to tycoon J.P. Morgan’s sister, Sarah Morgan. The museum hosts ongoing exhibits and performances. Guided tours available, schedule varies. Admission: $5-16. Open M-F 10 am-5 pm, Sa-Su 10 am-3 pm.