I have heard Viña del Mar and Valparaíso referred to as “sister cities” before, mostly due to the fact that they are literally next to each other on the map (with no smaller towns dividing them) and they have roughly the same population (about 300,000). However, I think a more accurate description of these two popular tourist destinations would be STEP-sisters, as they are definitely not of the same breed.
Viña del Mar is the well-manicured, uptight, sorority sister who comes from a wealthy family and enjoys activities like sipping martinis, wearing high heels, and getting her eyebrows waxed. Meanwhile Valparaíso is… well… sort of the crazy crackwhore of the family. Let’s compare:
The World Is My Boyfriend 