Some of the secrets of the world include the following: 1. The Sphinx of Giza in Egypt is the largest monolithic statue in the world. 2. In Antarctica, there is a volcano called Mount Erebus. 3. On 29 April 1770, Captain James Cook discovered Botany Bay. 4. In 1846, the first telegraph was invented by Samuel Morse. 5. On 15 January 1880, the first British telephone directory was published.