Rocks. Kentucky is home to the Red River Gorge which has some of the best sandstone rock formations in the world. Specifically, it has some of the best sandstone rock climbing in the world. Check out https://www.redriverclimbing.com if that remotely interests you or you can PM me or whatever.
Natural wonders in Kentucky would include, as mentioned just above, Red River Gorge, Cave Run Lake, Cumberland Falls, Laurel River Lake, Lake Cumberland, Dr. Thomas Walker State Park (Barbourville), just about anywhere in the Daniel Boone National Forest, Fort Boonesborough (SW of Winchester). Land Between The Lakes in western Kentucky.
In Corbin is the starting place of Kentucky Fried Chicken, now known simply as KFC, at Harlan Sanders Cafe. White Hall, home of Cassius Marcellus Clay (not Muhammad Ali), at I-75 Exit 95 in Madison County if you like history and historical buildings (same exit as for Fort Boonesborough).
There are several civil war battlefields across the state as well. The Mill Springs battlefield is actually pretty close to my home and is very well preserved and the curator there is extremely knowledgeable.
Beautiful homes, beautiful country, nice people, clean, well maintained roads, and some of the most BEAUTIFUL women in the country!
Kentucky has it all! I grew up right across the river from it (could see Kentucky from our doorway) and I always wanted to live over there. I never moved there but it would be my first choice in places to live!
There's also Grayson Lake, Yatesville Lake, Greenbo Lake, Carter Caves (incredibly interesting caves and lots of them), Blue Licks Battlefield, Lincoln's birthplace, My Old Kentucky Home, Jenny Wiley State Park, Cumberland Gap National Park, Black Mountain, Little Shepherd Of Kingdom Come park, the "road" along the top of the Pine Mountain ridge (runs through a huge bear sanctuary), Breaks Interstate Park (partly in KY and partly in Virginia and the most beautiful and deepest gorge in the eastern USA), Old Fort Harrod. Boone Station, Painstville Lake, a dozen other lakes and parks that go with them, Wickliffe Mounds, Pine Mountain Trail, Harlan Co. off road trails, Black Mountain trail system (not exactly open to the public but it is anyway), and about 10,000 other places I could think of if I sat here long enough.
When I was in college working on my journalism degree I came up with the idea of putting a section in the school magazine that detailed the state parks and other attractions in the area around my school (Morehead St. U.). My professor's wife was the managing editor for a chain of weekly newspapers. The year after I left school I saw all my work appear in a special supplement for all those weekly papers detailing all the tourist attractions from Natural Bridge and the Red River Gorge to Carter Caves to Grayson Lake and beyond. We tried to limit the area to a two hour drive from MSU. Those newspapers ran that supplement for about 15 years selling all sorts of ads to the people in the tourist industry. Of course I never saw a dime out of it. I just had the idea. They stole it from me so naturally they got the money. If you're out there Gene Murray I'll find you someday and hit you up for what you owe me.
At any rate Kentucky has a huge tourism industry and it just keeps getting bigger. There are a million reasons to go there. They have probably the best state park system in the nation and they're all free for picnics, using the lakes, etc.. Cave Run is the muskie capital of the world for example. If you've ever fished for muskie you'll know that's a tremendous rush. You have to thrown them back if they're under 50 inches if that tells you anything. And they have teeth like pit bulls only sharper. And they fight like blue marlin. And that's just one lake in Kentucky. They have a tremendous bass fishing industry. They had the world record for catfish at Greenbo Lake for many, many years. There's a million reasons to visit Kentucky. We haven't even talked about the beautiful scenery either in the rolling horse farm districts or the mountains in the eastern part of the state or the huge lakes in the western end of the state or the endless miles of lakes in the eastern part of the state.
Kentucky takes a a backseat to no other state when it comes to tourism. I could talk about the Jenny Wiley Trail or the well hidden Tygart Gorge that is almost virgin forest and I could talk about the actual virgin forests in Ky. and the old growth forests that are actually just like virgin forests. The list goes on forever. Picking just one reason to go to Ky. is a hard challenge.
There are so many wonderful reasons to visit Kentucky. Food is definitely one because local foods anywhere you go are a sure hit for your taste buds. So many awesome places to tour like Makers Mark or Wild Turkey distilleries. Land between the Lakes in western Kentucky for outdoor lovers. Historic downtown tours in Elizabethtown. I love all of Kentucky.