The Royal Gorge Bridge near Canon City, Colorado offers the ultimate in ancient two by four construction with one inch gaps in-between. It is nearly a two thousand foot drop to the Arkansas River, clearly visible through the gaps. The river is about 120 feet in width at the bottom of the Royal Gorge, but looks about 1/8" wide from the bridge. The boards are not bolted or nailed to the structure, fitting in a loose clamp assembly at either end. These boards move under foot as you cross. Cars are allowed to cross also, and the timbers literally rattle under them. Looking over the edge is breathtaking- looking through the gaps is somewhat worse. At the middle of the bridge is a sign that reads NO FISHING .

I highly recommend it.

LEJ