[Hérisson]

0			0

Under Moscow/Russia there would be LOTS of stuff, but the only public ones I found anymore are just some partypics. They tend to be a little secretive the folks there
<!-- m --><a class="postlink" href="http://www.speleoastronomy.org/expedit/2004/index.html">http://www.speleoastronomy.org/expedit/2004/index.html</a><!-- m -->

This particular one is in the outskirts of Moscow.

More photo of the place (with outdoor pictures) here :

http://barrier.marshruty.ru/Photos/Photo...aa9f92c5e7

What kind of place is it? A natural cave?

There is a famous river buried under the Moscow and Kremlin : Neglinka, and indeed many others underground networks.

Have you managed to visit it?