Red Spider Lily, that is. Also called the Equinox Lily, Magic Lily, or Hurricane Lily. Or Lycoris radiata to be precise.
One of the many great things about owning an older home, in my opinion, is that someone may've planted cool things in the yard. The first time early fall rolled around after we moved into this house, and I stepped out the backdoor and these greeted me, I was enchanted with them. Here are some pictures I took a few days ago:
Seems like these just pop up overnight. Boom, there they are, all red and bright and slightly Dr. Seuss-looking saying, "Hey, someone planted me here years ago so they could enjoy me." So I do make it a point to stop and admire them in their 2 or 3 weeks of glory and oddity. Thank you, whoever you are, for planting these. This house and its tended yard has been here since 1926 so it could've been long ago.
I've never done a thing but enjoy them each fall when they pop out of the ground, so they must do well here in our climate. They are native to China and Japan, often seen in groups on the ridge of rice fields.
If ingested they are supposed to give you lucid dreams. I wouldn't try that, though.