The Cathedral of Basilica is one of Istanbul’s most important tourist attractions, built by Constantine the Great and completed by the Emperor Justinian in the 6th century. It is a large palace-like hall. The cathedral features decorative sculptures, especially the Medusa, with 336 columns arranged in 12 rows.
Topkapi Palace was the seat of the Ottoman sultans and a major center of Ottoman Empire for more than 400 years, one of Istanbul’s most popular tourist attractions, consisting of four courtyard courts and many smaller buildings built together.
The blue Mosque
The Blue Mosque was built by the architect Sidfer Mohammed Agha in the Ottoman era, one of the most beautiful buildings in Turkey. The mosque includes the tomb of Sultan Ahmed I, which is named because it is covered with small blue tiles.