CAST_030827_022
Existing comment:
The crest above the gate is a replica of one that's inside the museum. The sign on that says:

Royal Coat of Arms.
The castles and lions of this simplified royal coat of arms of Spain are symbols of the kingdoms of Castillo and Leon, which joined to form modern Spain. Brought from Havana and installed in 1762, this stone graced the ravelin (the detached entrance fortification) until 1958, when it was removed and placed indoors. A replica of this stone can be seen in place in the ravelin.
Proposed user comment: