The branch of New York's Metropolitan Museum of Art that houses their collection of medieval art is located in Fort Tryon Park. The Cloisters was built in the 1930's and modeled after a generic European monastery. The architects were quite successful as walking through it you can't believe you're still in one of the largest cities in the world. My favorite time to go is the early Autumn when the air just starts to turn crisp. This is a view of one of the few courtyards.

Canon EOS 5D Mark II, EF 24-105 f/4 IS @ 47mm, 1/250th, f/4.0, ISO 100.