Wow I never heard of that guy so I looked up him up in Google images, holy smoke his paintings are mind blowing! Thanks! Now THESE are desktop pics!!
If wallpaper is what you are after, you can ask Google to find images exactly the same size as your monitor. Just replace the numbers with the proper pixel dimensions:
https://www.google.com/search?q=Albert+Bierstadt&safe=off&tbm=isch&tbs=isz:ex,iszw:2560,iszh:1600
It may help to use numbers that are a size or two up from your monitor, but in the same proportion.