No starchitect’s portfolio is complete without a jaw-dropping image by Iwan Baan. The Dutch photographer stumbled into the architectural world in 2005, when he pitched his services to Rem Koolhaas. Baan got the gig and began what would become his first major project: documenting the construction of OMA’s China Central Television (CCTV) building and Herzog & de Meuron’s completed National Olympic Stadium, both in Beijing. Less than a decade later, the likes of Frank Gehry, SANAA, Morphosis, and Diller Scofidio + Renfro keep Baan on speed dial. “What I find really fascinating is what happens when architects and planners leave and these places become appropriated by people,” explained Baan in his talk last month in New York at TEDCity2.0. Watch to learn about his search for pop-up cities and villages built in the unlikeliest places using the most bizarre methods.