Gallery One Art Gallery is located on Center St. in the heart of Mentor, Ohio. The gallery is dubbed as America's largest art gallery, fine art and custom framing shop, boasting over 18,000 square feet of art space. Gallery One offers customers quality fine art from world renowned artists, including Andrew Atroshenko, Greg Clair and Keith Ferris. Gallery One doubles as an auction house, selling artists's works in person and online. Owner Alan Brown has been an auctioneer for nearly 30 years.