The oldest bridge built on the Bosphorus had been the one built for the Persian King Darius in 513 BC. Leonardo da Vinci offered Sultan Beyazit II in a letter to build a bridge (that extends to Anatolian coast). But the opening of the giant suspension bridge realized only in 1973. The total lenght of the bridge is 1622 m; the height is 64m and the width is 34m. The construction cost of the bridge was amortized much earlier than expected. The toll is charged only towards one direction.