East Carondelet, Illinois is an amazing little town. First, it started as a stop in the rail line. There was nothing that seemed to set it apart from other stops along the way. It quickly became a melting pot full of people that would have traveled from all over the world. This is clear in the city's architecture, which is mostly French and Spanish.
Then, as time went on, it became the city that wouldn't go away. Four major floods wiped the city out; the last one occurred in 1993. Each time, the city pulled together and rebuilt.
If you want to see some history, you should visit Jarrot Mansion. It is said to be one of the most haunted places in the area. You can walk the property with your pup; you never know what you are going to see! You can schedule an inside tour, but, in most instances, pups are not allowed inside (the primary exception being service dogs).
For something more family-friendly, you could visit Gateway Park. Along the trails, there are geysers that are a unique sight to see. Go get a schedule and a map at the guest shop so that you don't miss out on any of the fun. You will need to keep your pup on his leash while you are visiting because of the wildlife.