| http://www.w3.org/ns/prov#value | - Gregorovius went to see Porta Sanguinaria (Bloody Gate), the most interesting gate of Ferentino, which is located in the southern side of the walls; its structure is a summary of different historical periods; the big boulders which flank its lower part were thought for a long time to have been built before the foundation of Rome (753 BC); they are now dated IVth century BC; the arch which closes t
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