Tourists visit the Rijeka Tunnel (also known as TunelRi) in Rijeka, Croatia, Aug. 19, 2020. The tunnel was dug to protect civilians from bombings during World War II and is now a tourist attraction. (Goran Kovacic/Pixsell via Xinhua)
Tourists visit the Rijeka Tunnel (also known as TunelRi) in Rijeka, Croatia, Aug. 19, 2020. The tunnel was dug to protect civilians from bombings during World War II and is now a tourist attraction. (Goran Kovacic/Pixsell via Xinhua)