It will never hold. That's what some experts thought when Günter Behnisch and his partners submitted their tent roof design to the 1967 architectural competition for the Olympic Park. But they didn't. And yet it held. On our two-hour park tour, our guides tell us everything about the success story of this construction, about planning and realisation, about twelve pylons, 8,300 acrylic glass panels, 74,800 square metres of surface and 137,000 nodes. All quite impressive. Finally, you will be allowed to raise the tent roof yourself on the small park model. This way you become an Olympic architect yourself. You'll be amazed.