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Iwakuni
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Underground Kingdom Mikawa Muvalley

美川ムーバレー

An entire adventure theme park located underground. The premise of the adventure is based on ancient writings found in a mineshaft that leads to questions about whether the world and its history is really as we perceive it to be. The ancient underground kingdom appears to have been inspired by Mayan culture, at least as far as the statues, art, and motifs used. They have a variety of mission quests with tasks you can complete, panning for gold, digging for gemstones, as well as caves and waterfalls, a restaurant, and an onsen.

Listing from Wikivoyage: Iwakuni, CC BY-SA 4.0.

Updated 28 Sept 2026. Something wrong? Tell us.