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Obelisk from the Gardens of Sallust 94. The Obelisks of Rome; Sundial of Augustus. Commentary. The obelisk of pink Aswan granite that now stands in the Piazza di Montecitorio, though not the largest of Rome's ancient obelisks (that distinction belongs to the obelisk at the Lateran), is perhaps the most interesting, and the inscription on its base gives the essentials of Rome's long-standing and continuing fascination with these ...