All roads lead to Rome—or more precisely to its most iconic landmark: the Colosseum. 　　Built under Emperor Vespasian in the 1st century CE, this magnificent monument, spanning two thousand years of history, is an emblem of the power of a bygone empire. With over seven million visitors a year, its massive structure and awesome architecture testify to the genius of ancient Roman bu... (展開(kāi)全部)