There were three notable times when the chain across the Horn was either broken or circumvented. In the 10th century the Kievan Rus' dragged their longships out of the Bosporus, around Galata, and relaunched them in the Horn; the Byzantines defeated them with Greek fire. In 1204, during the Fourth Crusade, Venetian ships were able to break the chain with a ram. In 1453, Ottoman Sultan Mehmed II, having failed in his attempt to break the chain with brute force, instead used the same tactic as the Rus', towing his ships across Galata over greased logs and into the estuary.
After the conquest of Constantinople in 1453, Mehmed II resettled ethnic Greeks along the Horn in the Phanar (today's Fener), while Balat continued to be inhabited by Jews, as during the Byzantine age. Today the Golden Horn is settled on both sides, and there are parks along each shore. The Istanbul Chamber of Commerce is also located along the shore, as are Muslim, Jewish and Christian cemeteries. The Galata Bridge connects the neighborhoods of Karaköy (the ancient Galata) and Eminönü.
Until the 1980s the Horn was polluted with industrial waste, but it has since been cleaned
Today its history and beauty make it a popular tourist attraction in Istanbul.
This image is shot from a metro crossing the Galata bridge.
Quoted from Wikipedia.