"ISTANBUL, April 7 -- President Obama closed out his eight-day tour of Europe and Turkey on Tuesday by reaching across cultural barriers -- meeting with Jewish, Christian and Muslim leaders, slipping off his shoes to tour a 400-year-old mosque and urging an audience of university students to "build new bridges instead of new walls" throughout the world.

"The world will be what you make of it," Obama said in the town hall-style meeting, where he emphasized, as he has in several earlier forums, the growing power of the world's youth to change politics and policies around the world..."