Celtic Dragon Secret Linden Wood Jewelry Keepsake Box (Only Opens If You Know the Secret Puzzle) Celtic Dragon - Secret Box. Hand-made in Poland Material: Wood. Dimensions: 6.00" X 4.00" X 2.25" Made of Seasoned Linden Wood From the Tatra Mountains in Poland Slide both side panels forward and then lift the lid to open the box. Crafted by Painting, Carving, and Burning