Masuria is famous not only for lakes — it's also a treasury of cultural heritage. 1. HOLY LINDEN SANCTUARY (Polish History Monument since 1983) — baroque basilica from 1693 with famous moving organ from 1721. 2. AUGUSTÓW CANAL (UNESCO candidate) — 102 km waterway with 18 wooden locks. 19th century engineering masterpiece. 3. ELBLĄG CANAL (Polish History Monument 2011, UNESCO candidate) — 84 km waterway with 5 inclined planes transporting ships over 99 m difference. Second such system in the world. 4. GRUNWALD BATTLEFIELD (Polish History Monument 2010) — site of the 15.07.1410 battle where Władysław Jagiełło defeated the Teutonic Knights. ADDITIONALLY: Wolf's Lair (Hitler's HQ), Boyen Fortress in Giżycko, Camaldolese Monastery in Wigry, Olsztyn Castle of the Chapter (Copernicus apartments), Stańczyki Viaducts ("Masurian Aqueduct").