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This viewing tower used to overlook a hilly landscape, in central Laos.
Since the Nam Ngum hydroelectric dam was built in 1971, the tower is submerged by the artificial lake the dam created, and some local tourists now use boats to climb it.

http://www.tochtermann.fr/files/gimgs/58_nam-ngum2.jpg
Nam Ngum Lake / Laos
http://www.tochtermann.fr/files/gimgs/58_nam-ngum1.jpg
http://www.tochtermann.fr/files/gimgs/58_nam-ngumdam.jpg