StockSnap is the best place on the internet to find beautiful free stock photos. It has pre-selected nothing but the highest quality, highest resolution pictures and added them to the database on a daily basis. This is not your typical crappy stock photo site.
All photos uploaded to the site are released under Creative Commons - CC0 and do not require attribution. No more hassle trying to figure out whether you can use photos for commercial use and whether you need to provide attribution.
StockSnap curates the best stock photos from around the web and also uploads photos from select photographers within its network. The end result is a bad ass repository of beautiful stock photography.