The Gold Coast mansion Chestnut Manor (formerly known as Wolver Hollow) in Upper Brookville is the site of this year's Mansions and Millionaires Designers Showcase. Tours run 11:30 a.m.-5 p.m. weekends and Columbus Day, 10:30 a.m.-4 p.m. Tuesdays-Fridays through Oct. 30. Photo Credit: Handout
Call it the ultimate open house -- the 2011 Mansion & Millionaires Designers' Showcase is now under way at Chestnut Manor, an eight-acre Upper Brookville estate on the market for $6 million. Here's a peek inside the historic Mount Vernon Colonial home.