Olavinlinna, a 15th-century castle in Savonlinna, Finland, is a major cultural landmark known for hosting the Savonlinna Opera Festival each summer. While some areas are accessible, certain parts of the castle may present challenges for visitors with mobility issues due to its historic structure. Exploring independently allows flexibility, but guided tours offer rich historical context. The opera festival season (typically July) is the busiest and most expensive time to visit; off-season visits provide a quieter experience. A typical visit lasts 2-3 hours, and entrance fees range from 15-20 EUR. Note that some areas may have seasonal closures, so checking the official website is recommended.