Teufelsberg listening station was used to listen to Warsaw pact military radio communications. It was built on top of an artificial hill constructed from the ruins of Berlin. Buried underneath the rubble is a military college designed by Albert Speer.
Recently, security has been tightened up, but there's an easy option: there are guided tours, in German (but the guide is happy to answer questions in English). This gives you unescorted access to the entire site. It costs 15 Euro.
The sign on this says "Document Disintegration Systems", so basically it's a big shredder:
This is a Faraday cage:
Recently, security has been tightened up, but there's an easy option: there are guided tours, in German (but the guide is happy to answer questions in English). This gives you unescorted access to the entire site. It costs 15 Euro.
The sign on this says "Document Disintegration Systems", so basically it's a big shredder:
This is a Faraday cage: