Thalia, Luke and Annabeth's old hiding spot
If you are in need of escape or supplies, near northern tip of Virginia is an old half-blood hideout big enough for three plus everything you could want for a campout or battle. Demigod provisions include mostly bronze javelin tips, a quiver full of arrows, an extra sword and a box of ambrosia. I would avoid the nearby MONSTER DONUT chain. Apparently it and all other franchise stores are magically linked to the life force of a monster. Some children of Hermes figured out how to do it back in the 1950s. They breed Hydra, and this particular one is pretty bad—seven necks, each topped with a hissing reptilian head.