Being able to attend Mass at the Station Churches is an immense blessing. When Rev. Mr. Williams said that we often are going to the places where the Saints died, he means it - a great number of the sites are at the places of their martyrdom (or in the case of the church of San Giovanni a Porta Latina, attempted martyrdom).
In future years, I highly recommend them to anyone who happens to be in Rome during Lent.
The North American College maintains a webpage that gives a short description of each of the churches, as well as provides a link to a map:
http://www.pnac.org/station-churches/the-roman-station-liturgy/
Also, George Weigel and his son have been accompanying us to every church throughout Lent, in order to take photos and gather information for a book that they are working on which should appear sometime next year.