Curiosities and wonders World records 28 Miscellanea 8 World history 7 Handbooks, vade-mecums, etc 6 History 6 Antiquities 5 Parapsychology 5 Architecture 4 Critical thinking 4 Historic sites 4 Juvenile literature 4 Questions and answers 4 Supernatural 4 Civilization, Ancient 3 Encyclopedias and dictionaries 3 Historic buildings 3 Monuments 3 Science 3 Anecdotes 2 Archaeology 2 Architecture, Ancient 2 Buildings 2 Children's encyclopedias and dictionaries 2 Children's questions and answers 2 China 2 Civilization 2 Crime 2 Criminals 2 Crop circles 2