Oldest athletic field or park that ever hosted an MLB home team and world series.
by Lee Cherry
League Park was built at the same time as Philadelphia's Baker Bowl which is sometimes called progenitor of this class Ballparks. The stadium was rebuilt for the 1910 season and in 1946 the owner renamed the park
League Park in Cleveland Oh is still in existence and is still an actual operating baseball park and has been used as an athletic field continuously since before 1900. It is configured exactly as it was at that time.
Cleveland’s League Park is actually the oldest baseball grounds of a major league club that still exists. The field is in the same location as it was in 1891.
Even http://www.projectballpark.org/sites says it is probably the oldest professional major league ballpark. It was built in a period when Baseball Parks were constructed of primarily Wood. It was one of the first ballparks to be rebuilt using the ,then new, Concrete & Steel building designs.
The park was built in 1910 and was if not for construction delays, would have opened before Shibe Park, and been the first Concrete and Steel stadium in baseball.
Concrete and steel ballparks became the rage and engineers made extensive use of that building technique starting in the early 20th century.