Maryland racing dates back to some of the earliest in the nation. Opened in Pimlico Race Course is the second oldest track in the United States. Before the. Live horse racing venue, race track, offering trackside seats, video simulcast betting, food service. See live events, latest programs, schedules and more. One of the world's largest all-motorcycle drag races and festivals, the ) – Maryland International Raceway ™ (MDIR) Track Champions were.