Just off Monte Cassino Street, tucked behind the modern resort buildings, stands the Sierakowski Manor House — a modest 18th-century wooden building that is one of the oldest structures still standing in Sopot. This makes it something of a rarity in a city whose built environment is almost entirely 19th and 20th century.
The manor is home to the Society of the Friends of Sopot, and it occasionally hosts exhibitions and events related to local history. The exterior is attractive in the understated way of Polish manor houses — whitewashed timber, pitched roof, a courtyard garden — and it provides a useful counterpoint to the grander resort architecture on the main street.