From BRIGHT SIDE.

Did you know there’s a theory that ancient underground tunnels secretly connect Europe? Archaeologists have found mysterious passageways under places like Scotland, Germany, and Turkey, some dating back over 12,000 years! These tunnels aren’t massive—just wide enough for a person to crawl through—which has sparked wild guesses about their purpose. Some think they were secret escape routes, while others believe they were used for trade, protection, or even religious rituals. Nobody knows for sure, but it’s fascinating to think about ancient people digging these tunnels with primitive tools.
Credit:
Guio- / Reddit
CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/:
Erdstall Ratgöbluckn: By Pfeifferfranz, https://commons.wikimedia.org/w/index.php?curid=18819935
Perg Erdstall: By Wolfgang Sauber, https://commons.wikimedia.org/w/index.php?curid=21131331
Erdstall Ratgöbluckn Perg: By Pfeifferfranz, https://commons.wikimedia.org/w/index.php?curid=18819687
Perg Erdstall – Gang: By Wolfgang Sauber, https://commons.wikimedia.org/w/index.php?curid=21131082
Perg-Oberösterreich: By TREM-RRRR, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, https://commons.wikimedia.org/w/index.php?curid=89509460
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