The fortress (Carlstens fästning), begun shortly after the Treaty of Roskilde (1658), overlooks the town and offers a splendid view of the coast and neighbouring islands.
Address:442 67 Marstrand
Phone:+46 303 611 67
Price:95 SEK (-15 years old 50 SEK)
end Jun-early Aug: 10.30am‑6.30pm (guided tours noon, 2pm, 3pm and 4pm); Jun and mid Aug-end Aug: 11am‑5pm (guided tours noon, 2pm and 3pm); rest of year: telephone for timetable; closed Nov-Mar