• Lovable Sidekick@lemmy.world
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        16 hours ago

        Interesting! I lived in the Bay Area and those tunnels were being built when I was a kid. It’s called BART - Bay Area Rapid Transit. My wife’s dad worked on them in SF as a construction worker. When they dug up old streets he brought cobblestones home one at a time, and built a whole wall of their family room out of them.