The Blue Mosque
It took six years to complete this blue-domed mosque that opened in 2008. Formally named the Mohammad al-Amin Mosque, it’s especially awe-inspiring when lit up at night, and the aquamarine dome and 65-foot-tall minarets reflect the traditional Ottoman style. Dress modestly and be prepared to remove your shoes; inside, opulent chandeliers light up incredible ancient calligraphic art. (Note: It’s next to the city’s oldest Greek Orthodox Church, also worth checking out).