Jacob's Cave is 6 mi. s. on SR 5, then e. on SR TT, following signs. One of Missouri's largest caves, Jacob's Cave is known for its depth illusion, reflective pools and ceiling spongework. Along with prehistoric bones and evidence of six separate ice ages, the cave is said to contain the world's largest geode.
Note: The temperature inside the cave is 53 F; visitors should dress appropriately.