16. Flatiron District Armory, 69th Regiment
Year Built: 1904-1906
Where: 68 Lexington Ave.
The 69th Regiment Armory is one of the few in NYC that still houses its original regiment. Along with the U.S. 69th Infantry Regiment (aka the Fighting Irish), the armory also uses the space for special events and was home to the first Armory Show. It was also the first armory built in the Beaux-Arts style instead of akin to a medieval fortress.