The Tennessee Aquarium features many crowd-pleasers — from penguins and sharks to swirling neon jellyfish. But the River Journey is unique to Chattanooga. Here, you’ll trace sea life of the Tennessee River from its mountain source to the Mississippi Delta. Don’t miss Miguel, the aquarium’s electric eel, whose currents are translated into a popular Twitter feed. Admission starts at $34.95 for adults, $21.95 for children ages three through 12, and is free for children under three.