NEWARK, Ohio (AP) — The U.S. border wall with Mexico is frequently in the news, but few people have a chance to visit it up close, or to see details of the various sections.Kenneth Madsen, an Ohio State University geography professor and border wall expert, hopes his new ph…

This June 15, 2017, photo provided by Kenneth Madsen, shows a post-on-rail style of fence along the flood plain of the Colorado River between Arizona and Baja California, which is typical of border wall fences placed in environmentally sensitive areas or in areas prone to floodin…

This June 15, 2017, photo provided by Kenneth Madsen, shows a post-on-rail style of fence along the flood plain of the Colorado River between Arizona and Baja California, which is typical of border wall fences placed in environmentally sensitive areas or in areas prone to floodin…