Occupying a small islet at the southern entrance to the Bosphorus Strait, the ancient watchtower of Kız Kulesi makes for a striking sight. Meaning the ‘Maiden’s Tower’ in Turkish, it has an observation deck and restaurant that offer fantastic views over Istanbul.

Remarkably enough, a tower has stood on the isle for almost 2,500 years with everyone from the Athenians and Romans to the Byzantines and Ottomans having erected one. Over the centuries and millennia, it has acted as a watchtower, lighthouse and quarantine station, and has even featured in numerous films such as Hitman and The World is Not Enough.