The trail into and up the rim of this tuff cone passes through tunnels, stairways, and remnants of a former coastal defense complex before reaching the summit. Nonresident entry is reservation-controlled, and the military engineering is as important to the OddWay stop as the crater itself.
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/oahu/diamond-head-state-monument/