Pedro IV Square, Praça de D. Pedro IV, King of Portugal, more commonly known as Rossio Square in downtown Lisbon, Portugal. It has been the setting of popular revolts and celebrations, bullfights and executions. The Column of Pedro IV is in the middle of the square.

A view of Alfama through narrow streets of Lisbon. Alfama is the oldest district of Lisbon, on the slope between the Sao Jorge Castle and the Tejo river.

The Lisbon tramway network, in operation since 1873, presently comprises six urban lines. In 1901 the network was electrified. The decline of the network began with the construction of the Lisbon Metro but the six remaining lines are still very important as sections of the city's topography can only be crossed by small trams.

Pigeons stand on heads portrayed in a statue at Largo de Camões.

The Lisbon tramway network, in operation since 1873, presently comprises six urban lines. In 1901 the network was electrified. The decline of the network began with the construction of the Lisbon Metro but the six remaining lines are still very important as sections of the city's topography can only be crossed by small trams.

The Lisbon tramway network, in operation since 1873, presently comprises six urban lines. In 1901 the network was electrified. The decline of the network began with the construction of the Lisbon Metro but the six remaining lines are still very important as sections of the city's topography can only be crossed by small trams.

The Lisbon tramway network, in operation since 1873, presently comprises six urban lines. In 1901 the network was electrified. The decline of the network began with the construction of the Lisbon Metro but the six remaining lines are still very important as sections of the city's topography can only be crossed by small trams.

A woman smokes a cigarette on a balcony in Lisbon.

Street art in Largo de Sao Carlos, Lisbon, in front of the National Theatre of Sao Carlos.

A view of Alfama through narrow streets of Lisbon. Alfama is the oldest district of Lisbon, on the slope between the Sao Jorge Castle and the Tejo river.

A view of Alfama through narrow streets of Lisbon. Alfama is the oldest district of Lisbon, on the slope between the Sao Jorge Castle and the Tejo river.

Pedro IV Square, Praça de D. Pedro IV, King of Portugal, more commonly known as Rossio Square in downtown Lisbon, Portugal. It has been the setting of popular revolts and celebrations, bullfights and executions. The Column of Pedro IV is in the middle of the square.

Pedro IV Square, Praça de D. Pedro IV, King of Portugal, more commonly known as Rossio Square in downtown Lisbon, Portugal. It has been the setting of popular revolts and celebrations, bullfights and executions. The Column of Pedro IV is in the middle of the square.

A view of Lisbon's Praça do Comércio, Commercial Plaza, a waterside public plaza on the Tagus or Tejo River.

A view of Lisbon's Praça do Comércio, Commercial Plaza, a waterside public plaza on the Tagus or Tejo River.

A sculptor balances rocks onto each other to create an art installation along the Tagus or Tejo River.

A sculptor balances rocks onto each other to create an art installation along the Tagus or Tejo River.

A street scene in Lisbon.

The Lisbon tramway network, in operation since 1873, presently comprises six urban lines. In 1901 the network was electrified. The decline of the network began with the construction of the Lisbon Metro but the six remaining lines are still very important as sections of the city's topography can only be crossed by small trams.