You can sign up to see Marc's Architectural Challenge series and view new images with an explanation to chosen composition along with a bit of technical information, just after they have been produced. You may even set him a challenge yourself!
"I relish a challenge, so each issue I lay down the gauntlet and give you the chance to suggest a building or structure that you believe presents a distinct photography challenge. I'll feature as many as I can, so don't hesitate, challenge me now!"
Just fill in the form and press submit.