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National Parks

Wonders are rare, you should add a 50% tourism boost for natural wonders.

You should also make some kind of side affect for the pollution generation whcich comes from parks like these. ( I didn't use this yet, so sorry for saying this if there is something like it already)

framedarchitecture, you should make a forest fire mod along with firefighter units.

I agree with João Davi. I think another part of this mod would be to go with something I think Civ IV had or at least some of the mods: The Forest Preserve. So instead of building markets or lumbermills on Forests (or just markets on Jungles) you could build the natural preserve feature.

In fact, one might go so far as to have slight variants. A national park which has tourists is going to generate gold and tourism whereas a nature preserve could generate science and perhaps some form of global happiness.

There is another mod like this one http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=153631376&searchtext=national+park

What tech unlocks this building?

they can generate tourism though right? have to have the natural wonders so there is +5 culture then build hotel and airport for 5 tourism.

This is dope. There should also be a lesser version for oases

I didn't even realize Natural Wonders didn't generate Tourism. The game needed this.

Could be created for forest reserves or lakes.