How we cite our quotes: (Story.Chapter.Paragraph)
Quote #4
Picturesque meant—[Rincewind] decided after careful observation of the scenery that inspired Twoflower to use the word—that the landscape was horribly precipitous. Quaint, when used to describe the occasional village through which they passed, meant fever-ridden and tumbledown. (2.1.2)
It's all about location, location, location. No, wait—maybe that's perception, perception, perception. Let's try this: The joy of exploration results from your perception of the location rather than the location itself. Ah, there we go.
Quote #5
"How do you know there's treasure in there?" [Rincewind] said.
Hrun heaved, and managed to hook his fingers under the stone. "You find chockapples under a chockapple tree," he said. "You find treasure under altars. Logic." (2.10.107-108)
One of the reasons the characters explore is because they wish to find something, somewhere, whether that's a home away from home or altars hidden away in the derelict temples of demonic nether-beasts.
Quote #6
At its base [Wyrmberg] was a mere score of yards across. Then it rose through clinging cloud, curving gracefully outward like an upturned trumpet until it was truncated by a plateau fully a quarter of a mile across. There was a tiny forest up there, its greenery cascading over the lip. (3.1.2)
One of the joys of exploring literature, especially in the fantasy and science fiction genres, is that you'll never know what you'll find. Upside-down mountains? Why not?