National Geographic Travelのインスタグラム(natgeotravel) - 5月15日 01時50分

Photo by @tylermetcalfe on the American Bike Project, Day 21 | National Park Ranger Vickie Carson stands in a giant corridor near the Historical Entrance to Mammoth Cave National Park in central Kentucky. With over 400 miles of mapped tunnels (and even more yet to be discovered) Mammoth Cave is the longest known cave system in the world, warranting the park's honorable distinction as a World Heritage site. #findyourpark #mammothcave

@tylermetcalfe is currently biking across the country along the TransAmerica trail. See more at natgeotravel.com by searching American Bike Project

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