I apologize, but there seems to be some confusion in your request. The Tennessee National Wildlife Refuge is actually located in the state of Tennessee, not Illinois. Here is a corrected summary for the Tennessee National Wildlife Refuge:

Summary:
The Tennessee National Wildlife Refuge is a natural gem located in the northwestern part of Tennessee. Established in 1945, this refuge spans over 51,000 acres and is managed by the U.S. Fish and Wildlife Service. It provides a diverse and vital habitat for numerous species of wildlife, making it a popular destination for nature enthusiasts and wildlife watchers.

Reasons to Visit:
1. Wildlife Viewing: The refuge is home to a rich variety of wildlife, including over 300 species of birds, mammals, reptiles, and amphibians. Visitors have the opportunity to observe bald eagles, white-tailed deer, river otters, bobcats, migratory waterfowl, and more.

2. Scenic Beauty: The refuge is characterized by its picturesque landscapes, including wetlands, forests, grasslands, and open water. It offers breathtaking views and opportunities for photography, hiking, and peaceful moments in nature.

3. Outdoor Recreation: Visitors can engage in a range of recreational activities such as boating, kayaking, fishing, hiking, and hunting (in designated areas during specific seasons). The refuge provides several boat ramps, trails, and fishing spots, ensuring a great experience for outdoor enthusiasts.

Points of Interest:
1. Duck River Unit: This area is known for its wetland habitats, attracting a vast array of waterfowl species. The Big Sandy Unit, located within the Duck River Unit, is a great spot for fishing, boating, and wildlife observation.

2. Big Sandy Peninsula: This peninsula juts out into Kentucky Lake, providing excellent opportunities for boating, fishing, and observing wildlife.

3. Wildlife Observation Towers: The refuge features observation towers that offer panoramic views of the surroundings, allowing visitors to get closer to the wildlife and take stunning photographs.

Interesting Facts:
1. The Tennessee National Wildlife Refuge is a crucial stopover for migratory birds on the Mississippi Flyway, making it a prime location for birdwatching.

2. The refuge is home to the largest wintering population of bald eagles in the state of Tennessee, with over 200 individuals recorded during the winter months.

3. Various educational programs, guided tours, and interpretive exhibits are available to visitors, providing insights into the refuge's unique ecosystems and its conservation efforts.

Best Time to Visit:
The best time to visit the Tennessee National Wildlife Refuge depends on your interests. Spring and fall are particularly popular for birdwatching, as numerous migratory species pass through the area. Winter is an excellent time to spot bald eagles, as they gather in significant numbers. However, each season offers its own charm, and the refuge can be enjoyed year-round.

Please note that even though the information provided here has been thoroughly researched, it is always recommended to verify specific details and check for the most up-to-date information on the official Tennessee National Wildlife Refuge website or other reliable sources.