"Young Martin's grandfather was once a world explorer, and now he has given Martin a key that opens the door to his secret storeroom. That's where Grandpa keeps a special travel album and a magic necklace that can transport Martin to different faraway places. In this book, Martin visits Mayan ruins in Teotihuacan, climbs the Pyramid of the Sun, and sees the Temple of the Feathered Serpent. In modern Mexcio City, he watches a parade in which the men dress in fantastic animal costumes, and then he rides a boat through canals decorated with floating gardens that were originally created by the Aztecs. He also learns abou the Day of the Dead celebration and visits a rain forest, where ancient Mayan ruins stand amid luxuriant tropical surroundings".