Which stadium is the oldest still in use in MLB?

Fenway Park is the oldest stadium still in use in Major League Baseball, serving as the Boston Red Sox's home since 1912.

The ballpark opened on April 20, 1912, replacing the Red Sox's earlier Huntington Avenue Grounds. It was built in Boston's Fenway-Kenmore neighborhood, whose dense surroundings left little room for expansion. That constrained setting helped produce Fenway's distinctive shape and several of its famous features.

The most recognizable is the Green Monster, the 37-foot wall in left field. Its height was increased in 1934, and the wall originally included a manual scoreboard. Fenway also has Pesky's Pole in right field and an unusual deep-space area known as the Triangle in center field. These quirks make the park unlike almost every modern MLB venue.

Fenway has undergone substantial renovation, including major rebuilding in 1934 and extensive preservation work in the 21st century, but it has remained an active baseball ground. The park hosted its first World Series in 1912, the same year it opened, and was added to the National Register of Historic Places in 2012 during its centennial year.