Category Proposal: Artificial Caves

[+Tobix]

Hello,

 

what about a new category artificial caves.

Caves that were built with manpower to

used for things like: Store material, protection

during a war, old mines, secret tunnels,……etc.

 

On the photo you can see an example. That

was an old cave that was built around 1900 to get special stones

to build furnace.

 

During the Second World War the cave were used

for the production of aircraft parts.

 

Regards

Tobix