Expedia is your one-stop shop for planning every aspect of your holiday. Find the ideal car rental to check out Kastamonu Castle, then add on hotels and flights to secure an amazing deal. Many car rental outlets offer free cancellation, so there's no need to stress about the cost if your plans change. Don't forget to join One Key™ — our free travel rewards programme — to earn OneKeyCash™* on your car rental and other bookings. This can help you save on your next memorable adventure, whether that's a city getaway or a month-long road trip! *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.