Curtiss Wanamaker Triplane
The Wanamaker Triplane or Curtiss Model T, retroactively renamed Curtiss Model 3 was a large experimental four-engined triplane patrol flying boat of World War I. It was the first four-engined aircraft built in the United States. Only a single example (No.3073) was completed.
Source: Wikipedia — Curtiss Wanamaker Triplane (CC BY-SA 4.0)