DM-Nastics #30: Into the Depths

1. The Catacombs of Paris (Paris, France)
Very necromantic but also organised, so i'm thinking the first librarian in a large arcane guilds library was often the butt of all the guild members jokes. He loved working with the books, creating order and learning so many things. So over time he studied necromancy and became a lich, creating his lair beneath the library and creating his undead army of servants so he could give the city and more importantly the guild the order and structure it needed. Some of the skulls will talk, as if Speak with dead is already cast on them, telling about their lives in the city, these skulls date back over a thousand years.

6. Waitomo Glowworms Cave (New Zealand)
Beautiful pic! - tunnel to the/in the Feywild. Each of the lights are tiny Fey dragonflies that zip around druidic/ranger characters, the tunnel emerges into a nature grove with many shrines made from vines shaped like different animals. Dire creatures and regular animals peacefull stroll around the area.
The cave itself can cure mental illness such as madness or addiction, but you can get so relaxed & entranced that you do not want to leave. The water is warm and smells slightly of lavender, the walls are cool and slightly damp.