This is the entrance to the first Alpine tunnel through an entire mountain, 
Monte Viso. It was begun in 1480 and opened in 1490. I send Latham and Don Cristobal into it at the closest point in their partnership, when they take guerrillas through on an unauthorized military expedition. Fun horror stuff happens on and inside Monte Viso. Resentment of Tuscan taxes inspired the French and Saluzzan monarchs of 1480 to dig from their respective ends. The former financial adviser in me was tickled by such sustained palpable tax avoidance schemes.
