North of Palermo is the barrio of Belgrano. It’s famous as a footnote in Argentinian history for being the capital of Argentina for a few weeks in 1880, until Buenos Aires was officially declared the capital. Today, it’s a mainly a residential district with high-rise condos and not much to see.
If you make the trip to Belgrano, you can get there by taking the Subte green line to Juramento and walking a couple blocks to Plaza Belgrano. The biggest points of interest I found in the barrio are centered around the plaza, which has a monument to Manuel Belgrano, one of the liberators of Argentina, in the center.
One side of Plaza Belgrano has the Iglesia de la Inmaculada Concepción, built in 1865. It is also known as La Redonda. It was influenced by the Pantheon in Rome. The other side has the Museo Histórico Sarmiento. This was the former town hall built in 1869. On the north side is the Museo de Arte Español Enrique Larreta.
Belgrano also has a nice park called Barrancas de Belgrano that’s pleasant to walk through.