Castle sights in Oulu
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There's not much left of Oulu Castle, although you can clearly see the remaining fort-like structure dominating the small park near the bridge. The observation tower of the castle, rebuilt in 1873, now houses a café, but you can go below and look in the cellar, which has a small interpretative display. The original castle was built in 1590 as a base for the Swedish army moving east towards Russia. The whole thing blew up in 1793 when a lightning strike hit a powder magazine.