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The Stallburg in Vienna.

An elegant 16th Century building on the edge of the sprawling Hofburg palace. It housed the royal art collection and the royal stables.

It was also home to Austria's most efficient intelligence organization.

A 🧵

#twitterstorians #IntelHistory
The late-Renaissance building with an inner courtyard surrounded by arcades was multi-functional: it housed the royal stables, guest apartments, the royal art collection, and an armoury. In fact, the ground floor is still used as the stables for the vaunted Lipizzaner Stallions.
Around 1711 the Stallburg also became the home of the Ziffernkanzlei--the 'Number Office.'

A name both suggestive and vague (and one of many used throughout the organization's existence), it was really the secret office for mail interception and decryption.
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