More than a thousand steep railroad-tie steps climb the side of Koko Crater along the route of a former military tramway built to service summit installations. The abandoned infrastructure has become one of Oʻahu's strangest and most physically demanding public stairways.
Filed under weird history: real events too strange to have made the textbook.
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Source: gohawaii.com/islands/oahu/things-to-do/land-activities/hiking