said: Idlewild is Pennsylvania's oldest amusement park. It was founded in 1878 by the Mellon family. It is probably best known for the Rollo Coaster (Serial #101), an ACE Coaster Classic designed by Herbert Paul Schmeck and built by PTC. This coaster has skid brakes, and opened in 1938. This is a wonderful family park, with a nice variety of historic and modern rides.