Schaufel – Wikipedia
We Still Don't Know Why Medieval Europeans Built Their Mysterious 'Erdstall' Tunnels - Atlas Obscura
File:Erdstall senkrechter schlupf.jpg - Wikipedia
Stein-Schule-1780
The erdstall – an underground world. Fascinating and mysterious, especially
Schleich 13824 - Farm World, Erpel, Ente, Tierfigur' kaufen - Spielwaren
The erdstall – an underground world. Fascinating and mysterious, especially
Phyllonorycter cerasinella - LepiWiki
Phyllonorycter cerasinella - LepiWiki
We Still Don't Know Why Medieval Europeans Built Their Mysterious 'Erdstall' Tunnels - Atlas Obscura