Text: Excursions further up the mountain take you to two medieval fortresses, on foot to Cetello di Taormina and, by car along a winding road, to Cetelmola, for grand views, although the summit of Etna is almost always swathed in clouds.
Entailment: There are two excursions up the mountain to medieval fortresses; Cetello di Taormina and Cetelmola.
Contradiction: There are no excursions up into the mountain worth taking.