At this site you can find information on birthstones. Listed by the month and gemstone type, find the birthstone that represents your loved ones birthday, for example

This is a free online volcano database, with information about all the currently known volcanoes. Every volcano features the basic statistics, as well as a very detailed map, with bot urban and satellite photos, and a google earth placeholder.

Google Earth is amazing free software that lets you view the entire world in 3D! You can fly anywhere around the globe and even see your own house from space.