Darkness and light in Lam Khlong NguNok Nang Aen cave. Kanchanaburi's Lam Khlong Ngu National Park opens two of its best attractions -- Sao Hin and Nok Nang Aen caves -- for roughly two months a year. Tham Sao Hin is a world of pitch-black darkness. Anybody wishing to visit Tham Sao Hin or Tham Nok Nang Aen must book a guided tour in advance. For more information, go to Lam Khlong Ngu National Park's Facebook page or call 084-913-2381.

Source: Bangkok Post January 28, 2020 00:22 UTC