If you want to see some of the most insane mountain bike dirt jumps in the world check out this trail tour and riding footage from Matt Jones at the Leatherhead Trails. The trails were all built by hand and shaped with clay to put a butter smooth surface on top. This trail work of art even includes massive vertical berms and a water pond onsite for building and maintaing the trails. I can tell you personally from the local builder scene that someone should buy these guys and endless supply of beer. It takes years of dedication to get trails flowing at this level. If you want to get inspired to go out and sling a shovel have a look at this creation!
Credit: Matt Jones