The narrow valley centers on the steep erosional remnant known as Kukaʻemoku or the ʻĪao Needle and was also the setting of the violent 1790 Battle of Kepaniwai. Entry is controlled by state-park rules and nonresident reservation requirements.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: dlnr.hawaii.gov/dsp/parks/maui/iao-valley-state-monument/