I found this on Wikimedia Commons here, and adjusted the image to make it clearer.
![Wooden model of Old St Peter's basilica in Rome.](https://i0.wp.com/www.roger-pearse.com/weblog/wp-content/uploads/2014/05/Model_of_costantinean_basilica_of_saint_Peter_in_the_vatican.jpg?resize=300%2C225&ssl=1)
Thoughts on Antiquity, Patristics, putting things online, information access, and more
I found this on Wikimedia Commons here, and adjusted the image to make it clearer.