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El corralito de piedra
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Declared national monument in 1995. It is the biggest and outstending defensive complex of the spanish military engineering in the new world and considered the guardian and protector of the city. Was originally constructed in 1536, being enlarged as it was required until 1657, by the military engineer Antonio de Arevalo. The fortification is a network of tunnels, galleries, ground elevations and trapdoors, with intrincate communication system and escapes passages, besides an ingenious interweaving of mines to blow it up if it fell under the power of the enemy.









 

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