Tunel Square : The southern end of Istiklal Street at Tunnel Square is where you board the Tunnel, Beyoglu's little two-station underground train, for the ride downhill to Galata (Karakoy). Tunnel is one of the charms of Istanbul. What makes this tunnel special is that it is the second-oldest subway line in the world, after the London Underground. It is more a nostalgic flashback to the past than a common way of transportation. In this area there are numerous hotels, cafes, foreign consulates, churches, schools and hospitals.