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This serene scene isn’t a buried relic from the Roman Empire or a magical underground fairy beach (which was my first thought, honestly), it’s actually a reservoir buried under one of the busiest, most crowded cities in the world.

Source: Reddit
Built in 1874, the tank lies undisturbed beneath the streets in the south of Paris and still supplies about 1/5th of the city’s population with fresh, clean water. It’s obviously closed off to the public to maintain its pristine quality, but oh, what I wouldn’t give to go for a dip…

Source: CNews
Original by Winona Dimeo-Ediger