The more than 3000 figurines are made from paper, wax, shells, lead, corn husks, tin, wood, marzipan, bread, hay, leaves, fabric, cork, terra cotta, sugar, biscuit - just about anything you can imagine. One entire cr che is built inside a hazelnut shell, and a Communist-era Polish one is topped by a red star. My favorite is a Czechoslovakian one made of paper. Quirico e Giulitta, and only a small nameplate can be seen from the street. Follow the long corridors and the blue and yellow electric lights to the exhibits.
Admission is free but donations are welcome.
The Christmas Fair in Piazza Navona lasts from December 8th to January 6th.