Explore Lisbon's 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 Lisbon's memorable monuments, viewpoints and neighborhoods. You'll get a lasting taste of Lisbon's history and culture on any line, so grab a ticket and hop on.