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A flagged portal
Whoever built that castle on the other side, they wanted to sort their treasure undisturbed.

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A portal to a secret trove of treasure
"'Stop thief! Stop thief!' There is a magic in the sound. The tradesman
 leaves his counter, and the car-man his waggon; the butcher throws down
 his tray; the baker his basket; the milkman his pail; the errand-boy
 his parcels; the school-boy his marbles; the paviour his pickaxe; the
 child his battledore. Away they run, pell-mell, helter-skelter, slap-dash:
 tearing, yelling, screaming, knocking down the passengers as they turn
 the corners, rousing up the dogs, and astonishing the fowls: and streets,
 squares, and courts, re-echo with the sound."
    -Charles Dickens, "Oliver Twist"