Wherein I randomly spout off about game ideas I have.....
This was from the last campaign I was a part of in Philly. It was a "blown up" Forgotten Realms, and we each took turns DMing, picking up where the last guy left off, and incorporating stuff others did into our own narrative.
One of my ideas was Dagon's Fang - a rock island off the Sword Coast with an ancient tower protruding from it. It had it's origins as shrine to Dagon and the dwelling place of one of the Demon Prince's most powerful oracles, as well as supporting flunkies/worshippers.
Eventually, that cult was wiped out by a powerful Sea Wizard and his allies. They used it as a home for awhile, but eventually all disappeared.
I was most proud of the tower map I had created, using CC3.