Rieti offers many testimonies of the medieval period. The monuments to visit are the Town Hall and the Episcopal Palace, churches of St. Dominic, St. Augustine and St. Francis dating from the XVII century, the late Renaissance the Church of Sant'Antonio Abate del Vignola, the Oratorio San Bernardino. Expanding is tourism and today the city is a bishopric. The Centre of Rieti is situated on a small hill on the edge of a plain called Rieti Plain that extends for about 90 km ², at an altitude of 405 m a.s.l. The plain was once occupied waters of Lacus Velinus and was reclaimed in Roman times by opening a rift between the limestone accumulated over the years at Marmore, leading to the waterfall. This Lake today remain only minor bodies of water: Lake Piediluco (Terni), to Twenty and Long ones (or Calicut) and Ripasottile. The last two are now placed in a nature reserve. The plain is surrounded by Mount Terminillo and Monti Reatini, to which it belongs, to the East, by the Sabine mountains to the West and is cut by the river Velino receiving, in it, the waters of the rivers Salto and Turano.