"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. In this book, a sandstorm greets Martin as he visits Egypt's great
Martin's grandfather has a magical book that takes Martin on an adventure to China, where he visits the Great Wall and Beijing and learns about Chinese culture.
Martin's grandfather has a magical book that takes Martin on an adventure to Brazil, where he visits the rainforest and Rio de Janeiro and learns about modern Brazilian culture.
Martin's grandfather has a magical book that takes Martin on an adventure to Mexico, where he visits Mayan and Aztec ruins and learns about modern Mexican culture.
