Most little girls go through a horse phase. I went though a castles phase. I checked David Macaulay's Castle out from the library more times than I could count, and basically memorized it, and then I drew castles all over everything I could get my hands on. So I was very excited to learn that, in Burgundy, France, a team of archaeologists are building a 13th-century castle, using only 13th-century techniques. It's like my favorite book come to wonderful life.