Fenway Park is a ballpark in Boston, Massachusetts, close to Kenmore Square. Since 1912, it has been the home field of Major League Baseball's (MLB) Boston Red Sox. While the stadium was built in 1912, it was substantially rebuilt in 1934, and underwent major renovations and modifications in the 21st century. It is the oldest active ballpark in the MLB. Because of its age and constrained location in Boston's dense Fenway–Kenmore neighborhood, the park has many quirky features, including "The Triangle", Pesky's Pole, and the Green Monster in left field. It is the fifth-smallest among MLB ballparks by seating capacity, second-smallest by total capacity, and one of nine that cannot accommodate at least 40,000 spectators.