One of my favorite exercises when we get to the Renaissance is to show them a virtual tour of the Sistine Chapel as I love looking at the marvel of my students when they see what one person can do. This link will give you access to that tour as well as the Roman Coliseum (inside and out), as well as the Taj Mahal, Stonehenge and the Great Pyramids in Giza. Thanks to a Tweet from F.C. Tymrak for this link. Tymrak doesn't have much on his blog, but he is a prolific Tweeter and if you want to follow him, just click on the "follow" icon on the upper right hand side of your Twitter account. By the way if you want to get lots of ideas for how to use Twitter in your classroom, I devote an entire chapter to it in my book, Deeper Learning Through Technology: Using the Cloud to Individualize Instruction, which is now less than a month away from being released and that you can pre-order here.