 The bridge that Tuco and Blondie blow was an actual bridge built by  the Spanish Army. The Spanish agreed to blow the bridge only if the  Armys Captain could be the one to do it. When it came to blowing  the bridge the Captain didnt notify Sergio Leone (I) (qv) and  just blew the bridge up without any cameras rolling. The Army was  so sorry with what they did that they rebuilt the bridge only to  blow it up again.