Directions:

The Institute of Experimental Physics (now moved to Viale delle Scienze), Via Archifafi 36, where technetium was discovered - N38 06.61 E13 22.39.
The Institute of Chemistry (now moved to Viale delle Scienze), Via Archirafi 34 - N38 06.65 E13 22.36.
Hotel Villa Archirafi, where Segrè stayed, Via Abramo Lincoln 30 - N38 06.77 E13 22.28
RR Station, Piazza Giulio Cesare - N38 06.62 E13 22.00