City Museum is a hundred-year-old warehouse in downtown St. Louis in which artists have repurposed the pieces of old cities to build miles of tunnels, slides, climbers, bridges, and castles. There are secret passages and grand galleries. Playgrounds and ball pits. A circus and a train. A rooftop school bus and a Ferris wheel.

Being at the heart of Union Station’s revival, a 120,000-square-foot aquarium, packed to the gills with over 13,000 animals across 44 exhibits. Guests at the new St. Louis Aquarium can explore aquatic life from sea to shining sea, without venturing out of the 63103 ZIP code.