Explore lisbons limitless compelling sights with the freedom of a hop on hop off bus tour with an optional line to cascais tickets are valid for 24 or 48 hours to grant you the most sightseeing flexibility this tour offers four different lines to choose from tickets valid for one two three or four lines with stops at lisbons memorable monuments viewpoints and neighborhoods youll get a lasting taste of lisbons history and culture on any line so grab a ticket and hop on