1,500-year-old Bridge Discovered in Pyongyang

"A 1,500-year-old wooden bridge has been discovered in the capital of the Democratic People’s Republic of Korea (DPRK), the official Korean Central News Agency (KCNA) reported on Friday. The 375-meter-long and 9-meter-wide bridge was laid between Chongho-Dong, of Taesong District, and Hyuam-Dong, of Sadong District, according to the report. The bridge was made without iron nails or cramps, the KCNA said." A bridge like that, that was made with out any nails or cramps is pretty amazing if it still stands to this very day. It must have been designed very well to endure every thing that has happened with in these lst 1500 years. But I think a big reason on why it still stands is that no one knew it was there, so no one could walk across it and break it.