Yesterday, I took my 4-year-old son to la Musée de l'Air et de l'Espace in Paris so he could see and walk through a 747 in real-life. This was after flying to Frankfurt on a 787, and seeing a 747 and A380 on the tarmac there. He said, "I want to go on those ones."

Managed to fulfill the 747. La Musée had an A380 on the tarmac too, but not open to walk through.

Honestly, for aviation geeks, it's a worthwhile visit for the 747 and Concordes alone.