The Cleveland Grays Armory Museum: America's Oldest Independent Armory. Grays Armory Museum is the home of the Cleveland Grays, a small non-profit, founded in 1837. The Cleveland Grays are a historical pre-Civil War Militia. The Grays would see battle in many American conflicts. The most notable are: the Civil War, Spanish American War and WWI. The Grays built their current armory in 1893 and it is still privately owned by the Grays. The Cleveland Grays Armory is the oldest Armory that is owned by its private civilian militia in America today. It is not only a city landmark but also on the National Register of Historical Places. The Cleveland Grays Armory Museum chronicles the Cleveland Grays from conception through today. We house many artifacts and preserve this beautiful Richardsonian Romanesqe Style building. The building has always doubled as a special event venue and we continue with that tradition today. Make Your Next Event A Part of History At Cleveland's Downtown Castle. The Cleveland Grays Armory Museum is a beautiful historic landmark in downtown Cleveland. Its unique and breathtaking architecture adds character and charisma to any event. We have hosted: Private Parties, Fundraisers, Rehearsal Dinners, Weddings, Sporting Events, Holiday Parties, Meetings and Seminars. The Armory has many rooms and areas that can be rented for different types of functions and events. Call today and find out how you can make your event a part of history!