St Tikhon Zadonsky Monastery is the oldest Russian Orthodox monastery in the USA. St Tikhon Bellavin, who later became Patriarch of Moscow and all the Russias, founded it in 1905 as a monastery and orphanage when he was ruling bishop in the USA. It still exists today, but the orphanage no longer exists. However, a seminary opened on the grounds in 1938, which still operates. Every year, on the American Memorial Day weekend, there’s a monastery open house and pilgrimage that draws hundreds of believers from throughout the USA (but mostly from the Northeast, especially from NEPA).