Onondaga Cave State Park is located in the Ozarks region of Missouri and is home to the Onondaga Cave, one of the most impressive caverns in the Midwest. The park offers a variety of outdoor activities, including hiking, fishing, and camping.

The main attraction of Onondaga Cave State Park is the Onondaga Cave itself, which is a natural wonder filled with unusual rock formations and underground streams. Visitors can take guided tours of the cave and marvel at the stalactites, stalagmites, and other unique features. The park also has a visitor center that offers exhibits and educational programs about the cave and the surrounding area.

In addition to the cave, Onondaga Cave State Park has several other points of interest, including the Meramec River, which is popular for fishing, swimming, and kayaking. The park also has several hiking trails that offer scenic views of the Ozarks, and a campground with more than 80 campsites.

Interesting facts about the area include that the Onondaga Cave was discovered in 1886 by a group of boys who were out hunting. The cave was opened to the public as a tourist attraction in 1897, and has since become one of the most visited caves in the United States.

The best time of year to visit Onondaga Cave State Park is in the spring or fall when the weather is cooler and the crowds are smaller. However, the cave is open year-round, and visitors can enjoy the park's many outdoor activities during the summer months as well.