THINK ‘chicken pizza’,” said our tour guide, Pepe, to help us remember the name of the next site. We all laughed, grateful for his help. We were taking a tour of Yucatan, Mexico, and Chichen Itza (奇琴伊察) was the name of the next ancient Mayan city we were about to visit. Yucatan is full of relics (遗迹) from the 5th- to 15th-century Mayan and Maya-Toltec civilizations (文明), and remembering all the different names was going to be difficult.