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Platanus × acerifolia
Tall tree with multicolored (white, gray, brown) trunk. Green leaves have a jagged edge.
Along the Tiber river in Rome, Italy
Aka London plane, London planetree, or hybrid plane
I second Noe and Pili that this is a plane tree (sometimes labelled as a sycamore, too)! I saw a lot of these in Italy too, there are some nearby where I live in England but I don't think they're big enough to show that cool mottled tree trunk yet :) I can only ID them by those neat seed balls that hang down. Lovely photos, the Vatican City is beautiful!