The Triskelion was built along the Potomac River on Theodore Roosevelt Island as an enormous complex that occupied almost all of the island. Its central structure was composed of three tall, thin, columnar buildings supporting a shared circular top floor. After completion, the Triskelion served as the primary headquarters of S.H.I.E.L.D. and housed many of its agents and operations. It was severely damaged after an Insight Helicarrier veered into one of its columns during the HYDRA Uprising.
