Kuressaare Castle, a remarkably well-preserved medieval fortress housing the Saaremaa Museum, is a must-visit destination. It's generally accessible, though some older sections may present challenges for those with mobility issues, while the main museum areas are largely navigable. Visitors can explore independently with informative displays or opt for a guided tour for deeper historical insights. The castle is open year-round, but hours may vary seasonally, so checking in advance is advisable. Expect an approximate entry cost of 10-15 EUR per adult. A typical visit duration to fully appreciate the castle and museum is 2-3 hours. Other useful insights include its stunning island location, impressive architecture, and well-maintained grounds, offering picturesque views and a journey back in time.