Caving/spelunking?

Is there a website similar to mountain project for Caving or spelunking?

Join a local grotto, it's the best information for your area. I have found that most caves have even greater land management issues than climbing and can't be accessed unless you are in a club.

NSS.com and cavechat.org are the best caving websites I use.
Keithb00ne is correct. You need to join your local caving club (aka grotto) to get into the caves. Caves are fragile ecosystems that can be trashed really easily. Because of this the caves are normally locked with gates and require keys. The keys are kept by local land management and trustees who are usually in the grotto club.