Old USAEst. 1776

State hub · KY

Kentucky

One historic landmark in Kentucky: Mammoth Cave.

Landmarks: 1
Eras: 1

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A national park ranger guiding tourists through Mammoth Cave. — Pictured Mammoth Cave
Daniel Schwen · CC BY-SA · via Wikimedia Commons

— The register —

Landmarks in Kentucky

Geological & Natural
Mammoth Cave
Mammoth Cave, KY
Beneath the rolling hills of central Kentucky lies the longest cave system ever discovered on Earth — more than 420 mapped miles of passages, and still growing as explorers connect new sections.