Pasaje Rivarola is a short, symmetrical passage near the Tribunales area, built so that the buildings on one side mirror those opposite. It is easy to miss from the surrounding streets, but the matching facades, balconies, and quiet scale make it a rewarding small detour for anyone interested in Buenos Aires architecture.
It works best as part of a walk through the centre rather than as a standalone destination. Come in daylight, when the rhythm of the passage and its details are easiest to see.