New Hampshire has 54 covered bridges, on a trip I was able to see a few. As to why covered bridges were built, some people say that the roofs protected the beams from rotting, or from freezing in bad weather. Others say that, since these bridges look like barns, animals would cross without fear. No matter the reason they are masterpieces of 19th-century engineering.
During this trip I also enjoy some railroad bridges that were very interesting.