Ancient City Archaeology

The ancient city now has small archaeology sections, which include the "Mourner" and "Plenty" pottery sherds (transferred from the cold ocean ruin), along with swift sneak books, the "Ward" trim, and the "Silence" trim (incredibly 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.