From Kauai’s stunning Waimea Canyon and Hawaii Island’s Kilauea Caldera to Maui’s Mount Haleakala, Hawaii is full of majestic natural wonders. The Aloha State is also home to several man-made wonders and pieces of architectural brilliance, including the longest tunnels in the state. Let’s take a look at these feats of engineering.

If you haven’t traveled through the Tetsuo Harano Tunnels along the H-3 Highway, you’re missing out on some of the best views of the Ko’olau Mountains you can find.

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