History: Near Doi Khun Tan National Park, the longest railway tunnel in Thailand, being 1,352.10 meters long. It was constructed in 1907 and completed in 1918, taking 11 years. Visitors can take a photo at the tunnel of Khun Tan by driving or by train to experience the beautiful nature.
Location: Khun Tan Village , Ta Bpaduk Sub-district, Mae Tha District, Lamphun Province
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