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Take a short hike along a nature trail that leads to an old man-made stone formation or labyrinth, also called jungfrudansen, the maiden's dance. There are many this kind of labyrinths around the coasts of the Baltic Sea, but nobody knows why they were made. The map of the trail can be downloaded from vastaboland.fi/web/kartor/sv_SE/naturstigar/_files/80606080380781342/default/Nagu%20naturstig1.pdf (with description in Swedish and Finnish only).
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Nagu kyrka
Medieval stone church built probably between 1430 and 1450. The pipe organ from 1791 was built by famous Swedish organ builder Olof Schwan.
Sjöfartshuset
Exhibitions telling about the seafaring traditions of Nagu from early 19th century to these days. Many ship models and paintings.
This 3-km nature and culture trail follows the footprints of the Nagu-born painter Victor Westerholm (1860–1919). He spent his childhood here on the Ernholm island and later became a renowned landscape painter. The circular trail starts from the market square and is well marked, but the forest part is poorly suited for disabled.
Fairly impressive bronze age burial cairn on top of the hill Jättekastet. In those days these islands were yet uninhabited, so nobody knows who the deceased was or what they were doing here. The best way to visit the site is to follow Westerholm Cultural Path from Kyrkbacken; there is more to see on the trail than just this grave. In the forest there is a rope to facilitate the climb to the hill (the trail has an alternative route around the hill, but then you miss the site). Both climb and descend are steep. Be careful.
Finnish: Seili
Lush island near Nagu Kyrkbacken, with a former leper colony, later mental hospital, now the Archipelago Research Institute of University of Turku. Famous for its history. A wooden church remains. Reached by boat or by ferry. Guided tours (in English by request), restaurant and accommodation in rooms for 1–4 persons with shared bathrooms and kitchens (since 2017). Take precautions against the ticks.
When approaching the ferry terminal in Pärnäs, take a small path from across the road, just opposite the bistro. After a few hundred metres you will reach a rocky shore with a memorial to the victims of the cruise ferry Estonia sinking on 28 September 1994, where most of those on board perished. It was the deadliest peacetime shipwreck to ever have occurred in European waters. There are monuments also in Stockholm and Tallinn (by the old town: Katkenud liin) and at a few other places in Estonia.