The route plotted is my best guess based on 5 geographic points:  Berlin, St. Gottard Pass, Milan, Genoa, and Merton.  Information that the Clemenses passed through St. Gottard Pass, Milan and Genoa come from personal correspondences.

February 29, 1892 Monday – Sam and Livy left the children to their studies in Berlin for the sunnier climes of the French Riviera and a three week rest to regain their health. According to Sam’s Feb. 26 to McClure, they took “3 or 4 days” to arrive, or by Mar. 3 or 4. The distance is nearly a thousand miles from Berlin to the Riviera, so they undoubtedly rested one or two nights along the way [Feb. 26 to McClure; Mar. 21 to Moffett]

March 24 Thursday – Sam and Livy left Menton for Pisa, Italy with Joseph Verey, their courier. The plan was for Verey to leave them at Pisa and return to Berlin to guide the rest of the party to Rome. The entire trip from Menton to Rome was about 400 miles. Sam and Livy may have stayed in Pisa a day, but arrived in Rome on Mar. 27 [Mar. 27 to Chatto].