1792 - Kentucky was the first state on the western frontier to join the Union.
1816 - (first promoted) Mammoth Cave, with 336+ miles of mapped passages, is the world's longest cave. It is 379 feet deep and contains at least 5 levels of passages. It's second only to Niagara Falls as the most popular tourist attraction in the US. It became a National Park on July 1, 1941.
1856 - The first enamel bathtub was made - in Louisville.
1883 - The first electric light bulb was shown - in Louisville. Thomas Alva Edison introduced his invention to crowds at the Southern Exposition.
1887 - Mother's Day was first observed - in Henderson by teacher Mary S. Wilson. It became a national holiday in 1916.
1893 - "Happy Birthday to You" - probably the most sung song in the world - was written by two Louisville sisters: Mildred and Patricia Hill.
Late 19th century - Bibb lettuce was first cultivated - by Jack Bibb in Frankfort, Kentucky
1896 - The first (known) set of all male quintuplets was born - in Paducah.
1934 - Cheeseburgers were first tasted - at Kaelin's restaurant in Louisville.
1937 - The first Wigwam Village Motel, with units in the shape of a "teepee" was built - by Frank A. Redford in Cave City.
The world's largest baseball bat, a full one hundred twenty (120) feet tall and weighing 68,000 pounds, can be seen at the Louisville Slugger Museum in Louisville (Jefferson Co.).
Chevrolet Corvettes are manufactured only in Bowling Green.
Covington (St. Mary's Cathedral-Basilica of the Assumption) is home to the world's largest hand blown stained glass window in existence. It measures an astounding 24 feet by 67 feet and contains 117 different figures.
The world's largest crucifix, standing at sixty (60) feet tall, is in Bardstown (Nelson Co.).
Fort Knox holds more than $6 billion worth of gold - the largest amount stored anywhere in the world.
The JIF plant in Lexington is the world's largest peanut butter producing facility.
Kentucky has more resort parks than any other state in the nation.
Middlesboro is the only United States city built inside a meteor crater.
Newport is home to The World Peace Bell, the world's largest free-swinging bell.
Pike County is the world's largest producer of coal.
Pikeville annually leads the nation (per capita) in consumption of Pepsi-Cola.
Post-It Notes are made exclusively in Cynthiana, Ky.
Shaker Village (Pleasant Hill) is the largest historic community of its kind in the United States.
Christian County is 'wet', while Bourbon County is 'dry'. Barren County has the most fertile land in the state.
Lake Cumberland has more miles of shoreline then the state of Florida