using a world map in a blog

Hi

Im building a travel related blog. I would like to be able to have a world map on which people can zoom in and out and click on to find already posted posts of a particular continent or country (depending on how much they zoomed in). In other words, This would be visual map version of categories of posts that would be linked to the map. But I will also have a normal list version of the categories.

Of secondary importance, but would be nice if every time someone posts there is an optional view of the map with pins in all the places people have posted.

thank you