sibeaster
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This former abbacy was once the main convent of Celestinians - followers of st Pope Celestin V. Now we can see the result of reconstructions of XVIII century so it's not as old as I want))) Moreover after secularization the convent "works" as a prison and most part of its treasuries were taken to museums or thieved. So it's more like nut-shell than real nut but it's still impressive. You can visit three cloisters of five, the former church, refectorium and library
Be careful: the convent is open for visitors with very strange timetable (see one of the photos)