"Ancient Mysteries" (2016) was the UK version of
Secrets (2013) (originally known as "Treasures Decoded" in the UK, Canada, and Australia, and released as "Secrets" in the U.S.), starting with the series' third season in 2016. Episodes in the series aired in slightly different orders depending on the country, and occasionally with different titles. The UK and U.S. versions also featured different voiceover talent for the narration.