[Blue Mosque] Sultan Ahmed Mosque is the national mosque of Turkey. It is called the Blue Mosque because of the blue color of the bricks used in the interior.
[Basilica Cistern] A palace located underground, once a city cistern during the Byzantine Empire
[Bosphorus] The strait divides Istanbul into two parts. Take a boat trip to the European and Asian parts of Istanbul to enjoy the scenery on both sides of the strait, and be surrounded by seagulls.