Boundary marker

boundary stone BE001 Three-Country Cairn East German border pillar Preston Monument boundary tree International Boundary Marker Four shire stone North Carolina-South Carolina Cornerstone Stone Cairn 1877 survey marker 48 The Grey Stone of Trough Iron Post Initial Point of Boundary Between U.S. and Mexico Four Corners Monument 1872 California-Nevada State Boundary Marker Austrian-Slovenian-Hungarian tripoint‎ coal-tax post Ellicott's Stone Mason and Dixon West Line Milestone Markers 76 and 77 London Stone MacDuff's Cross Clean Pool Old Treaty Elm Three Shire Stone