wall of china. we just happened to fly over it at the same time, i was like, wow, that would be pretty intriguing to jump the great wall. >> the great wall of china, which goes back to the fifth century, b.c. stretches more than 4,000 miles and stands about 25 feet high and 30 feet wide. >> it's a once-in-a-lifetime opportunity, so out of the box for somebody to go jump the great wall on a skateboard. so many things that motivated me to want to do it. the biggest challenge was can i get permission to do it? >> davey manages to get permission and starts building the ramp he needs to make the jump. >> we had to import a lot of materials they didn't typically have that we make skateboards out of. not only that, i happened to bring my u.s., my construction crew down there to work with the chinese to make sure this thing was sound and dimensions were translated correctly from --you