The opera is Strauss's Salome. This is the first time I can remember hearing of a performance, although I did once note a graphic novel based on it. The opera is based on Wilde's play of the same name. I have noted adaptations and performances of it here and links.
For more on Machaerus, the reputed site of John the Baptist's beheading, see here and here and links.
Cross-file unde Stagecraft and Ancient Architecture.
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