From perplexity ai

Madison Square Garden (MSG) has a rich history, marked by multiple iterations and locations. The first MSG was opened by P.T. Barnum in 1874 at Madison Avenue and 23rd Street, later replaced by a Beaux-Arts building designed by Stanford White in 1890[1][3]. This second version was demolished in 1925, leading to the construction of MSG III at 8th Avenue and 50th Street, which operated until 1968[4]. The current MSG, opened in 1968, is located above Penn Station and is renowned for hosting major sports and entertainment events[3].

Sources [1] History of Madison Square Garden – Blog - ExperienceFirst https://www.exp1.com/blog/untold-nyc-history-madison-square-garden/ [2] Madison Square Park Highlights - NYC Parks https://www.nycgovparks.org/parks/madison-square-park/history [3] Madison Square Garden - Wikipedia https://en.wikipedia.org/wiki/Madison_Square_Garden [4] Madison Square Garden (1925) - Wikipedia https://en.wikipedia.org/wiki/Madison_Square_Garden_(1925) [5] Madison Square Garden - TLTC Blogs https://blogs.shu.edu/nyc-history/msg-2/ [6] Madison Square Garden (1925-1968) - National Park Service https://www.nps.gov/places/madison-square-garden-1925-1968.htm [7] Madison Square Garden | concerts, sports, entertainment | Britannica https://www.britannica.com/topic/Madison-Square-Garden [8] The Theater at MSG Venue History - Madison Square Garden https://www.msg.com/the-theater-at-msg/history