Staggering photography from the largest cave in the world

[Orius]

Yeah, but none of those caves have drow, or ropers, or illithids, or aboleths or anything else of the kind. Those spelunkers have it easy!

 

[Klaus]

This all reminds me of Cappaocia in Turkey. That one always intrigued me for gaming ideas.

The landscape is somewhat alien looking, though inside has no spectacles like the other caves posted here, and many of the tunnels are man-made. Still, the scope and size of the labyrinthian caverns is pretty amazing.

Part 1 of a Cities of the Underworld episode on it:
YouTube - Underground Pelasgian cities in Cappadocia â•01â•£

If you zoom out of Cappadocia, the entirety of Anatolia is a great basis for a campaign setting:

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[OchreJelly]

Perhaps the denizens of Minecraft have been discovered as well!

 

[Phaezen]

And straight out of the middle ages to your gaming table: The Nottingham Caves

 

[CharlesRyan]

Really cool stuff. Thanks!