Rome Wasn't Built In A Day...

...but Sultan Mehmet II built Rumeli Hisarı (The Rumeli Fortress) on the shore of the Bosphorus Sea in just 4 months, between April and August in 1452. Covering an area of 30000 square meters, Rumeli Hisarı was built on the narrowest part of the Bosphorus Sea to protect the Ottoman Empire from unwelcome visitors.

Arnavutköy, between Ortaköy and Rumeli Hisarı.

Rumeli Hisarı from outside

Looking from Rumeli Hisarı across the Bosphrous Sea
Looking from Rumeli Hisarı across the Bosphrous Sea to Anatolian Turkey

Rumeli Hisarı - The fortress walls