This is Parrotia Persica, a beautiful tree I found in a Zagreb's Botanical Garden. I love it very much, the tree and the garden! The tree is huge, with branches that often touch the ground creating a ''tunnel'' around tree's log. It's like entering a different world,... far away from the city buzz. And the best thing is that this Botanical Garden is practically in a center of a city. You can find more info here.