Nik Peachy is an edublogger who recently posted a great "how-two" about Soundscapes from SoundTransit.
According to Nik, SoundTransit "is a really wonderful formulation of an idea. It's not just a huge collection of Mp3 sound files from all over the world, but the sounds have been tagged by country and described and a visitor to the site can take a sound journey around the world."
From the SoundTransit website:
"SoundTransit is a collaborative, online community dedicated to field recording and phonography. In the “Book” section of this site, you can plan a sonic journey through various locations recorded around the world. And in the “Search” section, you can search the database for specific sounds by member artists from many different places. If you are a phonographer, you can also contribute your recordings for others to enjoy."
This would be a fun application to use in a social studies or music class! It also looks like a good application to use on an interactive whiteboard or display.