Heart of the City's "Baixa" and "Lower City", an area where the São Jorge Castle and the Cathedral of Santa Maria Maior. The oldest district of the city is Alfama, close to the river Tejo. Other important monuments: Jerónimos Monastery, Belém Tower, etc..
"Jerónimos Monastery" and "Tower of Belem" in Lisbon in 1983, were included on the UNESCO world cultural heritage list.
The most important industries are active in Lisbon to steel, textile, ceramics, shipbuilding and fishing.
At the end of XIX th century urbanization was extended not only in the area near the river Tejo, and the outside (now Avenue of Freedom).