Big Bone Lick State Historic Site

Known as the “Birthplace of American Paleontology,” Big Bone Lick State Historic Site preserves the grounds where massive Ice Age mammals — mastodons, mammoths, and ancient bison — were drawn to salt and sulfur springs, only to become trapped in the surrounding boggy terrain. Their bones, discovered centuries later, captured the attention of Thomas Jefferson, who sent William Clark to excavate the site in 1807. That history alone makes this 712-acre park in Union, Kentucky one of the most scientifically significant spots in the eastern United States.

Today, a live herd of American bison roams a fenced pasture near the park entrance, giving visitors an immediate connection to the megafauna that once dominated this landscape. The on-site museum houses replicas of the prehistoric creatures alongside genuine fossil specimens, and an outdoor diorama trail features life-size models of mastodons at the original mineral springs.

Beyond the paleontology, the park offers solid hiking through wooded Kentucky hills, with trails winding past the sulfur springs that still bubble to the surface. Fishing is available at a small lake, and picnic areas are well-maintained throughout the grounds.

Spring and fall deliver the best conditions — mild weather for hiking and fewer crowds than summer weekends. The bison are active year-round, but the park’s wooded trails are particularly striking during October foliage.

With a 4.6-star rating across more than 3,000 reviews, Big Bone Lick consistently earns praise as one of Kentucky’s most underrated day trips — part natural history lesson, part peaceful outdoor escape.

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