William Wordsworth once wrote that: "Earth has not anything to show more fair" than London's Westminster bridge. But we can think of some pretty stiff competition for the title of world's loveliest water-span: the Golden Gate, Bridge of Sighs and the nail-less wooden so-called wind-and-rain bridges of China among them. But our choice is the stunning Khaju bridge of Isfahan, Iran, built in the 17th century as a dam across the Zayandeh river. With two gleaming storeys of elegantly tiled arcades and two large pavilions built for Shah Abbas II, it's an enchanting sight.
In pictures: 50 things to eat before you die
In pictures: World's sexiest cities
30 things you never knew you could do on holiday
The most boring places on the planet
Flying cruise ships, floating cities... travel of the future