<Li> Olympus Mons on Mars </Li> <P> Numerous other authors and organisations have composed lists of the wonders of the world . For example: </P> <Ul> <Li> British biographer, science writer, and novelist Ronald W. Clark published a book of man - made and natural wonders titled Wonders of the World, which lists 52 wonders, one for each week of the year . </Li> </Ul> <Li> British biographer, science writer, and novelist Ronald W. Clark published a book of man - made and natural wonders titled Wonders of the World, which lists 52 wonders, one for each week of the year . </Li>

When do the 7 wonders of the world change