Image: Mammoth Cave Historic Entrance
Size of this preview: 600 × 600 pixels. Other resolutions: 240 × 240 pixels | 3,000 × 3,000 pixels.
Original image (3,000 × 3,000 pixels, file size: 10.05 MB, MIME type: image/jpeg)
Description: "The Historic Entrance to Mammoth Cave is a natural opening that has been used by people for 5,000 years."
Title: Mammoth Cave Historic Entrance
Credit: https://www.nps.gov/media/photo/view.htm?id=375EC6C7-1DD8-B71B-0B98F2E5334629F5
Author: NPS
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
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