La ciudad que nunca duerme

A milonga

The cathedral where Pope Fracis used to say Mass. 

Tomb of General San Martín

Casa Rosada - the Pink House

The presidential palace of Argentina 

25 hours: Now I understand how Argentinians do so much but never seem to sleep!

In all seriousness, any time you are out, there are lots of people on the street and various restaurants open for business - day or night.