The Portas do Sol — the gates of the sun — was one of the entrances through the Moorish city wall, on the eastern side of the castle hill. The wall is gone and a terrace stands on the line of it, which is why the drop below is so abrupt: you are standing on the old defensive contour, looking down into the quarter the wall enclosed. Alfama falls away directly beneath in terracotta roofs, whitewashed walls, washing lines and the odd palm, and slides down to the water. The white mass of São Vicente de Fora sits to the left and the pale dome of the National Pantheon behind it.
This is a terrace people sit on rather than pass through. A kiosk usually operates on it with tables outside, and buskers with a Portuguese guitar often play there through the afternoon. The marble figure at the rail is São Vicente holding a boat with a raven at each end, which is the city's coat of arms, set here on what used to be the city's edge. A minute's walk downhill along Rua do Limoeiro is the Santa Luzia terrace, which adds a pergola and tiled panels showing Lisbon before the earthquake.