Essential tips for your visit to Istanbul: 20 must-know pieces of advice. 20. Take a walk through the historic district of Sultanahmet, which is known for its narrow, winding streets and historic architecture. 19 Visit the Pera Museum, which has a large collection of Orientalist paintings and other artworks. 18. Go to the Galata Tower, which offers great views of the city from its observation deck. 17. Take a tour of the Chora Church, which is known for its beautiful Byzantine mosaics and fresco