The Pombaline Lower Town (called usually as Baixa) area covers about 235,620 square metres of central Lisbon. It is an elegant district, primarily constructed after the 1755 Lisbon earthquake. It takes its name from Sebastião José de Carvalho e Melo, the Prime Minister to Joseph I of Portugal from 1750 to 1777 and key figure of the Enlightenment in Portugal, who took the lead in ordering the rebuilding of Lisbon after the 1755 earthquake. The Marquis of Pombal imposed strict conditions on rebuilding the city, and the current grid pattern strongly differs from the organic streetplan that characterised the district before the Earthquake.
The Pombaline Baixa is one of the first examples of earthquake-resistant construction. Architectural models were tested by having troops march around them to simulate an earthquake. Notable features of Pombaline structures include the Pombaline cage, a symmetrical wood-lattice framework aimed at distributing earthquake force, and inter-terrace walls that are built higher than roof timbers to reduce fire contagion.
Today Baixa area has elegant squares, pedestrianized streets, cafes, and shops. Old tramcars, street performers, tiled Art Deco shopfronts, elaborately decorated pastry shops, and street vendors selling everything from flowers to souvenirs, all lend a special charm to the area.
Baixa was placed on Portugal's tentative list of potential World Heritage Sites in 2004.References:
Roman Walls of Lugo are an exceptional architectural, archaeological and constructive legacy of Roman engineering, dating from the 3rd and 4th centuries AD. The Walls are built of internal and external stone facings of slate with some granite, with a core filling of a conglomerate of slate slabs and worked stone pieces from Roman buildings, interlocked with lime mortar.
Their total length of 2117 m in the shape of an oblong rectangle occupies an area of 1.68 ha. Their height varies between 8 and 10 m, with a width of 4.2 m, reaching 7 m in some specific points. The walls still contain 85 external towers, 10 gates (five of which are original and five that were opened in modern times), four staircases and two ramps providing access to the walkway along the top of the walls, one of which is internal and the other external. Each tower contained access stairs leading from the intervallum to the wall walk of town wall, of which a total of 21 have been discovered to date.
The defences of Lugo are the most complete and best preserved example of Roman military architecture in the Western Roman Empire.
Despite the renovation work carried out, the walls conserve their original layout and the construction features associated with their defensive purpose, with walls, battlements, towers, fortifications, both modern and original gates and stairways, and a moat.
Since they were built, the walls have defined the layout and growth of the city, which was declared a Historical-Artistic Ensemble in 1973, forming a part of it and becoming an emblematic structure that can be freely accessed to walk along. The local inhabitants and visitors alike have used them as an area for enjoyment and as a part of urban life for centuries.
The fortifications were added to UNESCO"s World Heritage List in late 2000 and are a popular tourist attraction.