ECONOMY
The convent where the Salamancans wrote their great works

Convent San Esteban. It is still there, you can just walk right in, though not between 2 and 4, when the guards have off. Arguably the Salamancans were the first mature economists, and the first decent monetary theorists, as well as being critically important for the foundations of international law, natural rights, and anti-slavery arguments. It is also difficult to find issues where they were truly bad.
You can just walk right in, and you should.
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