Hello, travellers! I will be in Paris in August and having already seen quite my favourite pieces of art in the Louvre, I'd now like to take a tour of the building's history and architecture. I'm particularly interested in seeing the medieval fortress foundations built by Philip Augustus in the 12th century, which I've read you can visit in the basement. Have any of you booked a tour with an operator that you would reccommend?
Many thanks!
Greer