The binge (actually Pinge) is a collapsed mine and one of the landmarks of Berg & Bingestadt Geyer. The crater is over 40m deep and home to some rare plant species. More information also under: haus-feig.de/binge-geyer
"The Royal Saxon Triangulation (here with the historical proper name) is a land survey carried out in the years 1862 to 1890 on the territory of the Kingdom of Saxony with simultaneous creation of a trigonometric network." - de.wikipedia.org/wiki/K%C3%B6nlicher-S%C3%A4chsische_Triangulirung