City Museum.

The City Museum in St. Louis is an expansive, 600,000-square-foot wonderland that blurs the lines between art, adventure, and play. Designed by artist Bob Cassilly, this immersive space features a surreal mix of salvaged materials, offering a unique playground where visitors can slide down over 30 slides, crawl through tunnels, and explore whimsical caves. Highlights include MonstroCity, complete with a towering castle turret, and a massive indoor ball pit that appeals to both kids and adults. Outdoor features include a rooftop Ferris wheel, hanging bus, and a striking 24-foot-tall praying mantis. The museum's eclectic design and interactive elements ensure a memorable experience for all ages, making it a must-visit destination in St. Louis.