Free zoo! One of the best in the country and a great way to spend an afternoon.
Free Art Museum if the weather is too hot or if it is rainy out!
One of the most beautiful parks in the city. Old ruins, greenhouses, festivals, lakes.
Site of the historic World's Fair in 1904, this park is larger than NYC Central Park and houses the zoo, museums, restaurants, parks, and beautiful views!
Not a museum at all but actually a huge playground for adults, definitely a St. Louis staple (and really fun to play around)
An old historic train station that is now a fancy hotel. They have an amazing bar if you want to sit in the huge fancy lobby for a drink and watch the (free) light show which takes place every hour on the ceiling. Also attached to union station is a fun area with an aquarium, huge Ferris wheel, and 50s styled restaurant.