When you can see how a physical structure that was built into a space fits harmoniously with the natural area - we see beauty. Both in the structure, in this case a bridge and the landscape, the creek, trees et al. This is clearly seen in the several bridges that span creeks and ravines on the carriage roads of Acacia National Park in Maine. This is the Cobblestone bridge near the Jordan Pond house an easy one to walk to and enjoy.
