The city’s northernmost and only mainland borough, The Bronx was for a long time believed to be its toughest and most crime-ridden district. In fact, it’s not much different from the other outer boroughs, though geographically it has more in common with Westchester County to the north than it does with the island regions of New York City: steep hills, deep valleys and rocky outcroppings to the west, and marshy flatlands along Long Island Sound to the east. Settled in the seventeenth century by the Swede Jonas Bronk, it became, like Brooklyn, part of New York proper around the end of the nineteenth century. Its main thoroughfare, Grand Concourse, was lined with luxurious Art Deco apartment houses; many, though greatly run-down, still stand. Just off the Grand Concourse, the new Yankee Stadium, at 161st Street and River Avenue (t 718/293-4300, w, is home to the most winning team in professional sports, 27-time World Series champs the New York Yankees.