Decades later, landmarks on popular Oahu hikes now unintentional symbols of Hawaii’s military...

Tucked away behind a row of homes in Lanikai lies a narrow dirt path that gradually turns into a steep, rocky incline up the Kaiwa Ridge. Reach the first flat area of the hike and you’ll see a small concrete structure off in the distance.

That structure is your destination — and it not only has a storied history, it offers those willing to sweat their way to the top of the ridge a perfect vantage point for a panoramic view of Lanikai Beach and the Mokulua Islands.

Welcome to Lanikai Pillbox, one of the state’s most popular hikes — with a 75-year-old military bunker as its showcase.