TIL during WW2 the Nazis spent the modern day equivalent of 100 million usd to make a underground base in Poland which saw little to no use. Soon after building it they lost the war, and it is now one of the largest bat habitats in Europe.

https://www.timesofisrael.com/former-nazi-defenses-now-home-to-thousands-of-bats/amp/
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1g4hyka/til_during_ww2_the_nazis_spent_the_modern_day/