Seven million people visit it annually but few disagree each visit is unique. From an evening ascent amid twinkling lights to lunch at 58 Tour Eiffel in the company of a staggering city panorama, there are 101 ways to ‘do’ it. Pedal beneath it, skip the lift and hike up, buy a crêpe from a stand here or a key ring from the street, snap yourself in front of it, visit it at night or – our favourite – on the odd special occasion when all 324m of the tower glows a different colour.