The Eiffel Tower

This was the woman who told Caroline how to get into the Louvre without queuing, legally, avec un billet. Do you think we are going to tell you how? 

The lady is there most days around 10.30 in the morning to walk her dog at the edge of Les Jardin des Tuileries. She speaks English. Clue: it is an entrance under an arch and is closed on Thursdays. There were just four people buying tickets when we found it. The queue to get in by the other two entrances was estimated at four hours—and this was February.