Hagia Sophia Museum / Church (Ayasofya)
Santa Sofia was for nearly a thousand years, the largest enclosed space in the world and is still seen as one of the world's most important monuments. It is one of Turkey's most popular attractions, people are drawn by the sheer spectacle of its size, the architecture, mosaics and art. It was built in the sixth century by the Byzantine emperor Justinian. It is closed on Monday.
Dolmabahce Palace was built in the 19th century. It is one of the most glamorous palaces in the world. It was the administrative center of the erstwhile Ottoman Empire when the last of the Ottoman Sultans was residing there. The Dolmabahce Palace is closed on Monday and Thursday.
Beylerbeyi Palace was commissioned by Sultan Abdulaziz (1830-1876) and built between 1861 and 1865 as a summer residence and a place to entertain visiting heads of state. The palace, built on a pier by the sea is a two-story structure built on a high brick basement. The palace, the Harem (north) and Mabeyn-i Humayun (the southern part) consisted of offices, three innings, six large living rooms, 24 rooms and 1 bathroom. It is closed on Mondays and Thursdays.