Empty water reservoir with archs
https://cdn.masto.host/dicecamp/media_attachments/files/115/344/415/943/554/100/original/9902c0f19796637f.jpg
every 3-4 years when they are cleaning it the authorities allow visitors into the #Lodz waterworks.
They are pretty fussy about security (I guess rightly so) but they do allow pictures.
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