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Pena Palace: the guards that aren't human
Pena Palace's guards: not human. This one fired itself. No soldier, no gunner. So who's keeping watch? It's still on the Queen's Terrace. It went off every noon, and nobody ever lit it. Its gunner was the sun: a glass lens over the barrel lit the powder. But the strangest guard waits at the gate. A sea monster holds up a whole window there, with vines growing out of his hair. The king designed him, to stare down everyone still outside. Back on the Queen's Terrace, look left, to the crag: a bronze knight keeps watch there. That last guard has a human face: most likely, the king himself.
If you go: On Pena Palace's Queen's Terrace, find the little sundial cannon the sun once fired at noon, then look left: the bronze knight on the crag across the forest is most likely King Ferdinand himself, guarding his palace.
Sources: Wikipedia: Sundial cannon · Wikipedia: Pena Palace