- The U.S. version, "Secrets" on Smithsonian Channel, aired episodes in a slightly different order, and Season One of "Secrets" included the episode "Richard III Revealed", which is not listed among episodes shown outside the U.S. under the "Treasures Decoded" title.
- "Treasures Decoded" aired in the U.S. as "Secrets", repackaged by Smithsonian Channel. Episodes of "Secrets" often had different titles than the UK/Canadian/Australian versions, and were aired in a slightly different order. The U.S. and UK versions also featured different voiceover talent for the narration.
- In some cases, content of the "Treasures Decoded"/"Secrets"/"Ancient Mysteries" series varied depending on the country of distribution. "Secrets" in the U.S. featured episodes not included in the Canadian package, for example, and "Treasures Decoded" in the UK featured episodes not shown in the U.S.
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