With Padlet's new multimedia mapping tool and the recent update to the web version of Google Earth there are more ways than ever for students to collaborate on creating multimedia maps. The three collaborative multimedia mapping tools that I'm going to recommend to most people for the foreseeable future are Google's My Maps, Padlet, and the web version of Google Earth. Tutorials for all three of those services are embedded below.
How to Create a Multimedia Map on Padlet
How to Use Google's My Maps
How to Create Tours in the Web Version of Google Earth