The Elevador de Santa Justa is a 45-metre cast-iron tower wedged between the facades of the Baixa, built to carry people up the height difference between the lower town and the Largo do Carmo. Raoul Mesnier du Ponsard designed it; the bridge at the top was opened in 1901 and the car itself in 1902. It ran on steam until 1907, when a British firm converted it to electricity. Two wood-panelled cabins with brass fittings do the vertical journey, and the tower is neo-Gothic where it did not need to be — tracery, spiral stairs and iron lace applied to a lift shaft.
It is often said to be the work of a pupil of Gustave Eiffel. There is no evidence for that; the resemblance comes from the period and the material, not from a connection. The top of the tower gives one of the better views over the Baixa grid to the castle hill, and here is the thing worth knowing: the upper terrace can be reached on foot from the Largo do Carmo, at the level of the ruined convent, without joining the queue at the bottom at all.