tour boats share the bosphorus with plenty of commercial traffic. the narrow and strategic strait is a bottle neck busy with freighters, including lots of ukrainian and russian ships, since this is the only route from ports on the black sea out to the mediterranean. for more crowds and urban energy, you can join the million commuters who ferry over and back every day from the asian side of istanbul. ferries shuttle in and out from all directions as seas of locals make their daily half-hour intercontinental commute. >> funding for this program is >> funding for this program is provided by subaru. female announcer: at subaru, we build vehicles like the rugged outback, with symmetrical all-wheel drive standard and plenty of cargo space for those who pack even more adventure into life. subaru, a proud sponsor of "globe trekker." ♪ captioning made possible by u.s. department of education >> a millennium of struggle for self-determination has forged a hardy pele