https://en.wikipedia.org/wiki/Secret_of_the_Incas
One of the most famous scenes - positioning the artifact at just the right moment to reflect the rays of sun to reveal... - straight out of the 1954 movie.
Secret of the Incas was filmed on location in Cusco, before it was a tourist destination. The city is raw, colorful, a snapshot in time. The script is full of humorous sarcasm, with an interesting (but fairly slow) story, based in fact.
As for Charlton Heston's character? The prototype for Indiana Jones: fedora hat, leather jacket, pistol, mannerisms...
The full movie is on YouTube: https://youtu.be/OYQD24HrNlU