In past centuries in Brazil (and other places, too) wealthy ladies sometimes traveled by litter - that is, by a sort of miniature carriage without wheels, which was carried by men or mules. These were used when roads were not passable by wheeled vehicle and protected the woman from prying eyes and the exertions and dirt of travel, which were put upon the men or beasts of burden instead. This particular type, which caught my eye at an exhibition at a museum in São Paulo, Brazil, is carried by two mules, which are led by two men. It appears to me to be a rather awkward form of transportation, but interesting nonetheless.
The image is from 1900. The original image, and images of other types of litters, can be found at the Museu Histórico Nacional. The description there says that litters were used in Brazil in the 17th century, to transport government officials and later, in the 18th, and even up until the 20th centuries, were a means to carry women as well as men. In town, they were usually carried by slaves, but for longer distances the mule-borne version was much more practical.
The National Museum of Coaches, in Portugal, has some beautiful examples of fancy European litters in their collection. This one is a particularly ornate mule-borne type of litter.