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It is well known that Freemasons certainly played a role in the construction of Washington D.C., and the city is full of persisent rumors that the street layout and other buildings are embedded with masonic code. It isn’t surprising that networks of underground tunnels (and even a subway just for those on Capitol Hill) were built beneath the city. More unique than the existence of the tunnels is how they’ve been hidden and if and how they are being used. In Washington D.C., they’re like underground cities, with all the things you would need from the outside world, moved underground. Streets become hallways lined by rows of earth and lights.
In 1924 a curious network of catacombs was discovered in Washington D.C. They were traced to Harrison Dyar, a Smithsonian entomologist who had been industriously digging tunnels in the city for almost two decades.
https://wearechange.org/theres-hidden-network-tunnels-underneath-washington-dc/