This time about half the distance of Lake Baikal, a kind of Florence Nightingale pilgrimage in a clockwise direction around the Black Sea – though Ukraine to Crimea (I don’t think Ukraine allows border crossings from the areas currently controlled by Russia but Streetview, probably from a few years back, makes it look so peaceful), then the Russian part of the coast, followed by Georgia on the southeast corner and then Turkey along the southern coast of the sea, finally to Istanbul and a visit to the Florence Nightingale museum at the Selimiye Barracks – if this is still open. From HvH the round trip is about 5000 miles, according to MyRouteApp.