As of July 2021 there are 2 lines being operated, the (green) castle line, which takes you through the tight historic city center towards the castle of Sao Jorge in a smaller bus (around 40min to complete the round trip), and the open'top double decker (red) Belem line which takes you outward from Lisbon proper, to the municipality of Belem, showcasing the famous coastal defense tower and a momument to the age of discoveries (around and hour and 10 min to complete). In Belem, you can also visit St. Jeronimo's monastery, the tomb of Vasco da Gama and the Maritime Museum. The audio guide is very informative and easy to understand, with pleasant intermissions featuring the local Fado music. For an additional charge of 12 EUR per person we booked the boat tour between Lisbon center and Belem as well. When we took the tour, it was quite empty, sometimes we were the only people on the bus, no doubt because of the Covid measures in Portugal scaring off foreign tourists, which is a shame!

The only good thing is that you jave the chance to see a lot in less time that any other eay. I bought ticket for 3 buses but find the time to use it for Cascais. In the winter it's difficult,since there are only 2 routes the day. And the stops should be more recognised. Example:at Belem there wasn't any sign for the bus stop. They should fix the plugs,lots of them weren't working.

We thoroughly enjoyed the hop on hop off experience in Lisbon. We did this the day after a private small group tour in Lisbon, as the opportunity to go back and see things we enjoyed in greater detail. The buses were clean, all worked well and they were on time. We regularly use these buses in cities across the world. Happy to endorse our experience in Lisbon and recommend. We had perfect weather.