Conversation so far:
what is the name of the highest mountain in germany
The Zugspitze is the highest mountain in Germany.
who high is the zugspitze mountain
The Zugspitze stands at 2,962 m above sea level.
who climbed the zugspitze first
The Zugspitze was first climbed on 27 August 1820 by Josef Naus, his survey assistant, Maier, and mountain guide, Johann Georg Tauschl.
what are the three normal routes to the summit of zugspitze
The three normal routes to the Zugspitze summit are from the Höllental valley to the northeast, the Reintal valley to the southeast, and from the west over the Austrian Cirque.

Question: when was the first cable car to the summit built
Self-contained rewrite: when was the first cable car to the zugspitze summit built