Lisbon is famous for (in no particular order):
azulejos (colorful hand-painted ceramic tiles on building facades, usually with a predominantly blue tint),
fado (a melancholy style of song popular in nightclubs), and
bacalhau (dried salt cod, which can apparently be prepared and served in hundreds of ways to please the Portuguese palate).
The World Expo ‘98 breathed new life into an area east of the old town center. New landmarks from the 1998 Lisbon World Exposition include the popular Parque das Nacoes (Park of Nations) and the striking Estacao do Oriente train station by my favorite architect/engineer, Santiago Calatrava.
Many of these superb photos of Lisbon and Belem were taken by my colleague and frequent travel companion, Chicago architect Marius Ronnett.
Quick Tips:
A handy place for a pit stop is the Lisbon Welcome Center at the northwest corner of the vast Praca do Comercio. You can pick up tourist maps, brochures, and get some helpful travel information from a staff member seven days a week. On every day of the week except for Sunday, you can visit the art gallery, cafeteria, and gift shop where you'll find traditional souvenirs. There is also a small information booth nearby along Rua Augusta.
The Mercado da Ribeira, located near the Estacao Cais do Sodre by the Rio Tejo, was formerly the central food wholesale market of Lisbon. Nowadays it is a grand place to look for locally produced cheeses, wines, and handicrafts. There are also spaces for occasional performances. On Sundays, there is a popular Collectors' Market with many dealers selling items like old coins and phone cards.
A nice grocery store in central Lisbon is Supermercado Celeiro at Rua 1 de Dezembro 73, not far from the Elevador de Santa Justa. You can get some quick snacks or small packaged meals here.
Best Way To Get Around:
Lisbon offers a wide range of transportation options. A good idea is to buy a Carris-Metro pass good for all-day travel on the metro, buses, trams (the number 28 tram is a slow but fascinating route to take), and even the various giant elevators and funiculars in the city. This pass is even good for riding the touristy (but fun) Elevador de Santa Justa.
There are several different passes you can buy (the one-day Cassis-Metro pass costs under three euro), so check out the one that will suit your transportation needs. These passes are available at major stations as well as the Praca da Figueira, though there is usually a line at this last spot. Lisbon is also an excellent city to walk around, but some of the many hills can wear you out.
There is a bus that runs between the city and the airport, but it does not run during off hours like at 6am, at which time you are basically stuck taking a taxi. Fortunately, the airport is not that far from central Lisbon, so the taxi fare will not be too exorbitant.