Tip: The Monserrat and Centro neighborhoods hold the city's grandest civic architecture within walking distance. Palacio Barolo is the highlight — a 100-meter building designed as a physical journey through Dante's Divine Comedy, with a glass lighthouse at the top offering 360-degree views of the city. The National Congress is across the avenue; guided visits run Monday to Friday but get cancelled if parliament is in session, so check the Senate website before going.