The Palazzo Spada, on the Via Giulia, features one of the more intriguing, and well-hidden, architectural secrets of Rome.

Borromini had the difficult problem of a small space to fill elegantly for his wealthy patrons, so he ingeniously used perspective to create a trompe l'oeil hallway of columns.

This photo is the view looking down the hallway of columns, as one would see it in passing without human scale added. As you can see, it appears Borromini created a majestic hallway leading to a great statue far away. But click on the photo to see more (in a new browser window)...