This striking mosque, whose interior is lined with more than 20,000 handmade ceramic tiles, is appropriately named for its blue hues. Constructed in the 17th century, the Blue Mosque sits across from Hagia Sophia in the old city. This was intentional, as the Ottoman sultan at the time wanted to build a structure that would rival the Hagia Sophia in grandeur. Today, the mosque is one of the most visited attractions in Europe. There is no entrance fee but visitors must remove shoes and women must cover their heads and shoulders before entering. Also keep in mind, the mosque closes five times daily for 90 minutes for the call to prayer.

Cruise The World with #inCruises Membership Program