Combine a bosphorus strait sightseeing cruise with a tour of kksu palace or rumeli fortress on this exciting 25 hour istanbul experience with an onboard guide learn all about the city and enjoy water side views of dolmabahe palace galata tower bosphorus bridge and more help yourself to snacks on board and then hop onto dry land for a tour of either rumeli hisar fortress mondays and thursdays only or kksu palace one of istanbuls opulent hidden gems