"The medieval round Galata Tower built in 1348 has played many roles for Istanbul over the years: A watchtower for Bosphorus trade, an observation deck for spotting fires, the setting of a legendary flight across the Bosphorus, and now a tourist attraction offering 360 degree views of Istanbul. Hands down, it’s the best way to see how the city spreads across its European and Asian sides. Go for sunset, but arrive early to beat the queue."