Retiro District, Buenos Aires
Perhaps the most interesting thing about this district, which is also very near the centre, is the Torre de los Ingleses (Englishman's Tower) which is modelled on Big Ben with a clock and bells and was a gift from the English to celebrate the centennial of the May Revolution (which incidentally is on May 25th - while we were there - so we saw all the parades).

However, more interesting than the Tower itself is that directly opposite it, across the street, has been built the war memorial to the Argentinians who died in the Falklands War. I felt distinctly uncomfortable in this area, although we never once received any bad treatment or hostility from the Argentinians during our trip.