Final answer:
The passage aims to educate readers on history or architecture of Pisa's monuments and to describe the travel experience in Italy as portrayed by Mark Twain.
Step-by-step explanation:
There are two main purposes for reading the passage from CHAPTER XIV of The Innocents Abroad by Mark Twain. Firstly, the passage serves to learn about history or architecture, as Mark Twain describes the physical characteristics, construction oddities, and other architectural aspects of the Leaning Tower of Pisa, Duomo, and Baptistery. He provides vivid descriptions that reveal the leaning structure, the use of marble and granite, and the age of these buildings. Secondly, reading this passage can be seen as a way to learn about traveling to Italy, providing a detailed account of what one might expect to see and experience when visiting these historical sites, including sensory details and personal reflections that add depth to the travel narrative.