One title on the list:
The Two Towers by JRR TolkienRead about the other works on the list.
But what are the two towers that give the title to the second volume of The Lord of the Rings? Minas Tirith, site of the trilogy's last battle? Minas Morgul? Or a couple of the other towers on the tower-thick map of Middle Earth: Barad-dûr, Cirith-ungol, or Isengard (where Gandalf is held by Saruman until rescued by an eagle)? Take your pick.
The Lord of the Rings also made Lev Grossman's list of the six greatest fantasy books of all time, and appears on John Mullan's lists of ten of the best volcanoes in literature, ten of the best chases in literature, and ten of the best monsters in literature.