GuruShots is a photography website that hosts "The World’s Greatest Photo Game,” In their latest challenge, they invited participants to submit their best photos of "Impressive Architecture." The challenge received thousands of entries and millions of votes. You can see the three winners of the challenge as well as hundreds of top rated images below.
GuruShots offers a wonderful community for people to share their photos with. There are constantly new themed challenges that offer a wide variety of prizes hosted every week.