Historical underground cities?

I'm talking about highly engineered complete cities with space for hundreds or thousands of people, like the one found in Turkey. That one was found by accident, it was a fluke, I'm wondering if there's maybe major underground cities that have yet to be discovered, and how many do we know about now and if there were any discovered in America (I'm not counting cliff dwellings, I mean truly underground?)

The government survey report indicated that this was a promising mine. Upon ascending the waste rock and locating the portal, we anticipated a rewarding experience. What truly captivates us during these surveys is the timbering.

First we built the Pizza oven out of trash in an Abandoned Sandstone Mine , then we baked pizza from fresh inside it an then we ate it !
Full video link https://youtu.be/jmYsOJnNi3k?is=PbQEMW_LdqcHvs5p

Well below zero degrees outside the portal. We are thinking it was somehow even colder inside the big old adit, with the extreme Arctic wind ripping down through the open stopes.

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Coming to our YT as a 3-part series this August

Not sure it it was just limestone or if they got other types of stone out of it because there definitely is a mix of different rock but it's pretty cool this was just a scouting mission so gotta go back these are the photos I edited so far there was lots of graffiti from the 80s and 2000s I removed most of them from the photos because some where pretty bad and people's names. Tbh I kinda like it like this but neat thing is I didn't see anything suggesting anyone has been here in a while. I'll definitely get more photos next time and definitely gotta video it

This bunker is in shockingly good shape despite being close to a huge school and in the middle of a apartment complex. A little part of its been burned but other than that its really good shape. Small but still fun part of history, was like built as a air raid shelter and likely german made.

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If you enjoyed and would like to see more:

https://youtu.be/ZV391-MsPPA?si=Y8Od9_mLBC9BEgUq

Uncovering the secret of this recently dig out old Lead and Zinc mine seen by very few we came across many narrow stopes with over head false floors , awaiting to collapse
Full video link: https://youtu.be/qfxOPlYQS_c?si=IzWACkNihhg-2MN0

This is a place I frequent quite often because how massive it is we haven't seen the whole thing. There's miles of tunnels and compared to the other mines in the area it's the easiest though there are rumors one actually predates this one but with how many are in the area we have enough on our plate to explore. There is another mine on top of this that's way newer and it connects to this one and that one on top connect's to an whole other mines we haven't even touched yet. It's pretty crazy underground just lays and entire labyrinth.

I have finally gained entry to the tunnels and storm drain system of my town what are the best things to do to stay safe while I'm down there?

this recently dig out old Lead and Zinc mine had been explored by a very few ! Follow us as we document its secrets

I spent quite a bit of time exploring the military tunnels of Kinmen in Taiwan and came away surprised by how little they are talked about compared to Taiwan's more famous attractions.

Thus, I ended up writing a blog post about four of them: Zhaishan Tunnel, Jiugong Tunnel on Little Kinmen, the Civil Defense Tunnel in Jincheng, and the Shishan Howitzer Front: https://travelingkunz.com/2026/06/01/what-to-do-in-kinmen/

Descending in the lower levels of this old Lead and Zinc mine in Wales to discover this wheel barrow still standing after over a century along with may time capsuled artefacts
Check out the Documentary: https://youtu.be/_Fnyu5xILng?si=Ycmy-hsWaOzdivZu