Ancient cities now have archaeology, with the “Mourner”, “Plenty”, “Blade”, and “Explorer” pottery sherds (transferred from the cold ocean ruin), swift sneak books, enchanted golden carrots, the “ward” trim, and the “silence” trim (rarely.)
Snowy archaeologist villagers (those with a snowy outfit, found in snowy villages) will sell a map to ancient cities, giving you a better method than “dig around under snowy mountains” to find them.