Forts and Cannon of Oman.

[fernando]

Originally Posted by Ibrahiim al Balooshi

... Also showing the slot down which boiling hot oil was poured turning the attackers into human toffee apples ! ...

Amazing. I have never seen 'murder holes' in the form of slits; quite handy for pouring scalding date syrup.
As in this side of the world is stone that abounds, holes are circular, as 'non holes' are also available; it is the intention that counts.
You have them also by the dozen, as in this example situated in the middle of the country, where machicolations, toped by brick arches, must have been a Mudejar (you know the term ?) work.

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