X Direct connection between Lisbon Airport and several central points of the city. Buy your tickets here. Get discount on all Yellow Bus sightseeing tours if bought aboard vehicles or at the ticket office at Pra a do Com rcio . BE INSPIRED BY OUR VIDEOS See all Sightseeing Tours Lisboa | Yellow Bus Tours.Bel m Tower, officially the Tower of Saint Vincent is a th century fortification located in Lisbon that served as a point of embarkation and disembarkation for Portuguese explorers and as a ceremonial gateway to Lisbon. Bel m Tower is situated meters southwest of yellow bus tour , . Photo Rehman, CC BY SA .