The National Aquarium, Baltimore has a pretty cool jellyfish exhibit. “Jellies Invasion: Oceans Out of Balance” combines eerily lighted displays of jellies floating in futuristic tubes with educational material about the threat the creatures pose to the world’s oceans. They multiply like crazy and are invading new seas, changing the dynamics of these ecosystems. It’s curious that a brainless, spineless jellyfish can wreak such havoc (but, as is often the case, we humans are really to blame…). If you go, I recommend buying tickets online in advance. You can bypass the crowds, pick up your tickets at at the will-call kiosks, and walk right in.