Bairo Alto is a district on a hill. At the viewpoint/park with the name of Miradouro de São Pedro de Alcãntara, one is offered excellent views over the lower lying areas of the old city of Lisbon.
In this view you are looking across the Baixa district, towards the Tagus river and Barreiro on the far banks of the river. In the left corner of the picture, you just see part of the roof of the Rossio Station building - the main station of the city. The twin tower building is the Sè, which is the city cathedral. Barreiro is just one of the many villages and towns, surrounding Lisbon, that has grown into sleeper cities.