Istanbul wonder from east to west, 1000 things to see... Topkapi Palace, it was once the home of emperors of 3 continents. It is a must-see for everyone as it homes a great view of Istanbul, traces of hundreds of years of history and priceless treasures. Hagia Sophia Museum, once a church, then a mosque and now it is a museum. This more than a thousand year old work of art will attract you in. Not to give any spoilers, don’t forget to make a wish inside. Blue (Sultan Ahmed) Mosque, half thousand year old mosque, built by Mehmet Agha (last student of architech Sinan) welcomes millions of tourists every year. Fine tiles brought by Iznik make it look bluer that it is.