re: Apparently, there are 6 of these (probably more) underground 'cities' in the USA. Why?

We gots one in NOLA, near da lake between West End & Ponchartrain Boulevards.

It’s “moist” in there.

Like REALLY moist.

New Orleans Historical Link

Other Link (unrelated)

Been there for work. Not really a city. Caves that keep a constant temp that's good for cheese/beer etc.

I saw Godzilla 2014. Those facilities are a bit more remote & heavily guarded.

During college I I had a job loading tailers for a company. It would take hours to load the finished wood work. So, we usually got to talking to the drivers (Ie Mayflower). One driver, and I understand.. Drivers can be like fisherman, but I asked, .."what's the craziest story you got?". And he said he picked up a load at a medical facility in Baltimore area. He had an armed passenger with him the whole trip. He had a military vehicle trail him the whole trip he got to NV and entered this base...keeps driving to a mountain, goes around to an entrance and doors open up ...he pulls in and goes to a designated stop point...another truck/trailer pull up and back to his .... Contents are transferred and he left never knew what was in the bed but it was a massive facility inside of that mountain ...

.gov has built and maintained several shelters since the beginning of the Cold War. Mount Weather in VA, Raven Rock in PA-which was used during 9/11.

The Federal Reserve had a shelter in Mount Pony, VA. Some of the AT&T long lines towers had shelters underneath them.

And, not to mention, a bunch of decommissioned Atlas, Titan and Minuteman silo sites spread across the west. There's a ton of cold war relics here in the States.

I wouldn’t mind a converted bunker or silo into a nice military grade Hobbit hole myself.

There's an old Atlas ICBM silo in Texas that was converted to an AirBnb. We passed by it on our trip to Texas on Thanksgiving week.

Ive been inside the greenbrier bunker. The one in the video looks like a mine.

Although it's a good ways from the New Madrid Fault, I'd hate to be in there when the next big one strikes.

There’s an Underground Mall here in Atlanta. There are more firearms there than most military installments.

Also, I don’t think that’s nearly deep enough to be a bunker facility. The doomsday one they moved the Kennedys to during the Cuban Missle Crisis is way deep. Same with the one in Colorado.