A powerful whirlpool of water and stone carved this large, smooth granite pothole at the foot of a cascade in Franconia Notch. Nineteenth-century visitors compared its near-perfect rounded walls to an enormous natural basin. It is reached by a short public trail from the parkway. Secondary source: https://www.atlasobscura.com/places/the-basin
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: nhstateparks.org/find-parks-trails/franconia-notch-state-park