Santa Maria Scala Coeli (Saint Mary of the Stairway to Heaven) is a Roman Catholic Church located on the grounds of the Tre Fontane Abbey located on Via di Acque Salvie 1 in the Quartiere Ardeatino (Q. XX.) in Rome. This is one of three churches affiliated with the Trappist monastery, and is located on a small lane, Via delle Tre Fontane, inside the abbey complex. The location of this church is held by tradition to be where St Paul the Apostle was imprisoned.[1] on Via delle Tre Fontane in Rome.