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Instead of finding paid parking space on one of ever crowded parking lots in historical center of San Marino, we parked at free parking lot in Borgo Maggiore (https://goo.gl/maps/oUcXnf5GQQ32), wandered through nice historical streets there and took a cable car up to Monte Titano.
The cable car runs every 15 minutes, is spacious and costs only 4.50EUR for round trip ride. On a good weather the view and feeling from the ride is breathtaking.