Arenal was Costa Rica's most active volcano until 2010, and one of the ten most active volcanoes in the world. Although the activity nowadays is less damaging, you can still see ash columns, underground rumbling, glowing orange lava flows and sudden explosions on a daily basis. With its perfect conical shape it allows breathtaking views of volcanic action in the summit. Almost every night the crater offers a spectacle of lights with its explosive eruptions. (From Wikipedia)

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