So, Barcelona was once a Roman town called Barcino, and they were so good at building stuff that evidence of their presence remains. This is part of the original city walls and a support for an aqueduct:
I loved wandering around here and imagining that I was walking in the footsteps of a young Roman soldier, away from home for the first time and scared and excited at the same time to be in a strange new city.
There was a cafe next to this big still-standing Roman wall.
I like to think there was a cafe in the same spot two thousand years ago, and maybe that soldier stopped there for a cool drink.