Get a glimpse of istanbuls fascinating imperial legacies on this half day sightseeing tour with an expert local guide first visit hagia sophia once one of the largest basilicas in the world and now the second most visited museum in turkey venture below ground to the ancient basilica cistern which once supported the great palace of constantinople and hone your haggling skills at the bustling grand bazaar one of the worlds largest and oldest covered markets where you can shop for jewelry