Kew Gardens Hills began to flourish after the subway was extended to Kew Gardens at Queens Boulevard and the 1939 World's Fair came to Flushing Meadows-Corona Park. It has among the largest orthodox Jewish population of Queens, the largest concentration of Afghanis in the New York metropolitan area, and a sizeable Muslim and Sikh population. There is the usual mix of low-rise housing stock, 4 to 6-story garden apartment buildings and a few public housing projects. These are similar to the rest of Queens with the distinction of having more garden space or service alleys between streets producing many prominent informal back-of-house extensions. Although there is some debate as to what the exact boundaries of Kew Gardens Hills are, the general consensus is that it is bounded by Flushing Meadows-Corona Park to the west, Parsons and Kissena Boulevard to the east, Union Turnpike to the south, and Mt. Hebron Cemetery and 73rd Avenue to the north.