Answer:
When I point up itβs bright. When I point down itβs dark.
In Paris but not in France the thinnest of its siblings.
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
Dark, feathery, and popular in Baltimore and fantasy books.