Carousels are one of my favorite things to visit while traveling. They are beautiful pieces of history that you can actually interact with. They often operate in essentially the exact same way they did when they were first created, give us the rare opportunity to step back in time and experience something the same way our grandparents may have.
Beyond that, they are also generally inexpensive and can be a great photo opportunity.
The Balboa Park Carousel in San Diego is one of the last remaining with a brass ring game. Riders on the outside row of seats can try and grab for rings hanging near the outer edge of the carousel. The rider that snags the brass ring gets a free ride.