While those caves were manmade there are a bit further north many natural caves in the Swabian Jura (Schwäbisch Alb). Many of those are rather small as well. Their importance lies elsewhere. Some of the oldest artifacts of mankind have been found there (50,000 to 30,000 years BC). ruclips.net/video/MssXCsTjDgk/видео.html Considerable younger but directly at (in) Lake Constance: Prehistoric Pile Dwellings (from 4,000 BC) ruclips.net/video/k5dHEOdBguU/видео.html
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2:34 I GET KNOCKED DOWN BUT I GET UP AGAIN
While those caves were manmade there are a bit further north many natural caves in the Swabian Jura (Schwäbisch Alb). Many of those are rather small as well. Their importance lies elsewhere. Some of the oldest artifacts of mankind have been found there (50,000 to 30,000 years BC).
ruclips.net/video/MssXCsTjDgk/видео.html
Considerable younger but directly at (in) Lake Constance: Prehistoric Pile Dwellings (from 4,000 BC)
ruclips.net/video/k5dHEOdBguU/видео.html
Thanks for sharing!