On first impression, it might seem a bit antiquated or even charming to see all the horse-drawn carriages ferrying people about in Cuba. However, the U.S. economic blockade of Cuba for over 50 years now has not been without impact in several areas. Restrictions on the importation of goods has made cars prohibitively expensive for the vast majority of people.
As many people depend on public transportation to get around, the costs can still be too expensive when compared to that of a horse-drawn carriage. Even for the cities with public transportation, the routes and options can be limited, and horse-drawn carriages have filled the transportation gap.
Still, the mix of classic American cars and horse-drawn carriages does seem to provide a special blend of lost-in-time you aren't going to find anywhere else.