Aerial view of Lisbon old centre, Lisbon, Portugal, Europe

Traditional Tram in Lisbon on the urban streets, Lisbon, Portugal, Europe

Fountain on the Rossio Square (Pedro IV Square), Lisbon, Portugal, Europe

Monumento aos Combatentes do Ultramar, Belem, Lisbon, Portugal, Europe

The lighthouse reflected in the blue water under the blue summer sky, Cascais, Estoril Coast, Lisbon, Portugal, Europe

Sunset on the Padrao dos Descobrimentos (Monument to the Discoveries) reflected in Tagus River, Belem, Lisbon, Portugal, Europe

Aerial drone view of Martim Moniz Square in Lisbon, with wider view of northern districts of Lisbon in the background, Lisbon, Portugal, Europe

Praca do Comercio, monument of King Jose I, Baixa, Lisbon, Portugal, Europe

Praca do Comercio and Victory Arch, Lisbon, Portugal, Europe

Gradil near Lisbon, Portugal

Statue of Jose I and Triumphal Arch, Lisbon, Portugal, Europe

Setubal viewed from Sao Filipe Castle, Setubal, Lisbon Coast, Portugal, Europe

Tourists and visitors enjoying views of the city at sunset in Lisbon, Portugal

Turret of Torre de Belem, Belem, Lisbon, Portugal, Europe

Graffiti at Arialva on the banks of the Tagus, Lisbon, Portugal, Europe

Aerial drone panoramic view of Cascais historic centre with the iconic Bay and Ribeira Beach, 30km west of Lisbon on the Portuguese Riviera, Cascais, Portugal, Europe

Vasco de Gama Bridge reflecting in the Tagus River, Lisbon, Portugal, Europe

The Church of Santa Engracia (National Pantheon), a 17th-century monument, Lisbon, Portugal, Europe

Poets Cascade, Garden of the Marquis de Pombal Palace, Oeiras, Lisbon municipality, Portugal, Europe

Monument to the Discoveries, Lisbon, Portugal, Europe

Aerial drone view of Padrao dos Descobrimentos (Monument of the Discoveries), a monument on the northern bank of the Tagus River estuary, Belem, Lisbon, Portugal, Europe

View of the ancient Castelo dos Mouros with its stone tower, Sintra municipality, Lisbon district, Portugal, Europe

Setubal viewed from Sao Filipe Castle, Setubal, Lisbon Coast, Portugal, Europe

Setubal viewed from Sao Filipe Castle, Setubal, Lisbon Coast, Portugal, Europe

The Santa Justa Elevator, Lisbon, Portugal, Europe

Tourists and visitors enjoying views from bars and restaurants of the city at sunset in Lisbon, Portugal

Sanctuary of Our Lady of Espichel Cape, Sesimbra, Lisbon Coast, Setubal, Portugal, Europe

Graffiti at Arialva on the banks of the Tagus, Lisbon, Portugal, Europe

View over the old town to Castelo de Sao Jorge castle, Lisbon, Portugal, Europe

Female runner jogging along the Marina at Parque das Nacoes, Lisbon, Portugal, Europe

View from Portas do Sol over the old quarter of Alfama, Lisbon, Portugal, Europe

View of the Alfama Neighbourhood, Lisbon, Portugal, Europe

View from Santa Luzia viewpoint over Alfama district to Tejo River, Lisbon, Portugal, Europe

Cloister, Monastery of the Hieronymites (Mosteiro dos Jeronimos), UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Aerial drone panoramic view of Santa Marta, Santa Marta House Museum and Condes de Castro Guimaraes Museum next to turquoise water in Cascais, Lisbon Region, Portugal, Europe

Typical shop fronts in the city centre, Lisbon, Portugal, Europe

Aerial drone view of Belem Tower, UNESCO World Heritage Site, a 16th century fortification on the Tagus River, Belem, Lisbon, Portugal, Europe

Castelo de Sao Jorge, Lisbon, Portugal, Europe

View of the National Palace with its conical towers, Sintra, near Lisbon, Portugal, Europe

View from Castelo de Sao Jorge to Sao Vicente de Fora church, Lisbon, Portugal, Europe

City lights on the typical architecture and old streets at dusk while the tram 28 proceeds, Alfama, Lisbon, Portugal, Europe

Aerial drone view of Cascais historic centre with the iconic Bay, 30km west of Lisbon on the Portuguese Riviera, Cascais, Portugal, Europe

Cityscape viewed from the Sao Jorge Castle, Lisbon, Portugal, Europe

Elevated view of the Pedro IV Square, Lisbon, Portugal, Europe

View of the Pedro IV Square, Lisbon, Portugal, Europe

Poets Cascade, Garden of the Marquis de Pombal Palace, Oeiras, Lisbon municipality, Portugal, Europe

Parque Eduardo VII, Lisbon, Portugal, Europe

Twilight view of the Carmo Convent, Lisbon, Portugal, Europe

Museum of Art Architecture and Technology (MAAT) and Museum of Electricity viewed from the Tagus River, Belem, Lisbon, Portugal, Europe

High view of the city center, Lisbon, Portugal, Europe

View over Alfama district from Miradouro das Portas do Sol, Alfama, Lisbon, Portugal, Europe

Miradouro de Santa Justa, view towards the Sao Jorge Castle, Lisbon, Portugal, Europe

Aerial drone view of Belem Tower, UNESCO World Heritage Site, a 16th century fortification on the Tagus River, Belem, Lisbon, Portugal, Europe

Cityscape of Lisbon and Castelo de Sao Jorge, Portugal

The old Elevador de Santa Justa in Lisbon, Portugal, Europe

Jeronimos Monastery with late Gothic architecture, UNESCO World Heritage Site, surrounded by gardens, Santa Maria de Belem, Lisbon, Portugal, Europe

Former Panoramic restaurant, Monsanto, Lisbon, Portugal, Europe

Padrao dos Descobrimentos (Monument to the Discoveries), Belem, Lisbon, Portugal, Europe

Belem Tower, UNESCO World Heritage Site, viewed from the Tagus river, Lisbon, Portugal, Europe

Aerial view of the Liberdade Avenue, Lisbon, Portugal, Europe

Praca do Comercio, Lison, Portugal

Poets Cascade, Garden of the Marquis de Pombal Palace, Oeiras, Lisbon municipality, Portugal, Europe

Espichel Cape and the Atlantic Ocean, Sesimbra, Lisbon Coast, Setubal, Portugal, Europe

Parque Eduardo VII, Lisbon, Portugal, Europe

Igreja de Sao Miguel, Alfama, Lisbon, Portugal, Europe

Lisbon, Portugal, Europe

The Monument to the Discoveries by the Tagus River, Lisbon, Portugal, Europe

Monument to the Discoveries at dusk, Belem, Lisbon, Portugal, Europe

Miradouro de Santa Justa, view over downtown and Santa Justa Street towards the castle hill, Lisbon, Portugal, Europe

Queluz Palace, Lisbon, Portugal

Statue of Jose I, Praca Do Comercio, Lisbon, Portugal

View over Alfama district from Miradouro das Portas do Sol, Alfama, Lisbon, Portugal, Europe

Cityscape viewed from the Sao Jorge Castle, Lisbon, Portugal, Europe

View over the old town to Castelo de Sao Jorge castle at sunset, Lisbon, Portugal, Europe

Monument to the Discoveries, Belem, Lisbon, Portugal, Europe

View over Lisbon, Portugal, Europe

Statue of King Jose I on Praca do Comercio, Lisbon, Portugal, Europe

Praca da Figueira, Lisbon, Portugal, Europe

Tram, Lisbon, Portugal, Europe

Houses of the Campo de Santa Clara below the Igreja da Santa Engracia, Panteao National, designed by Joao Antunes, in Alfama area of Lisbon, Portugal, Europe

Alien tourists in comedy street show, Expo '98, Lisbon, Portugal, Europe

The Vasco da Gama Bridge, Europe's longest, over the Tejo River Estuary, Mer de Paille, in Lisbon, Portugal, Europe

Turrets of the 16th century Belem Tower silhouetted in the sunset, in Lisbon, Portugal, Europe

Mosteiro dos Jeronimos (Monastery of the Hieronymites), dating from the 16th century, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Mosaic compass, Monument to the Discoveries, Belem, Lisbon, Portugal, Europe

Mosaic compass, Monument to the Discoveries, Belem, Lisbon, Portugal, Europe

Aerial view of Belem Tower, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Monument to the Discoveries, Belem, Lisbon, Portugal, Europe

25th April bridge over the Tagus river and the Christ Statue in background, a gift from Brazil, this smaller replica represents the lasting friendship of the former colony), Lisbon, Portugal, Europe

Mosteiro dos Jeronimos (Monastery of the Hieronymites), dating from the 16th century, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Mosteiro dos Jeronimos (Monastery of the Hieronymites), dating from the 16th century, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

The Queluz Palace gardens, once the summer residence of the Braganza Kings, Queluz, near Lisbon, Portugal, Europe

Boys in folkloric costumes, Festa de Santo Antonio (Lisbon Festival), Lisbon, Portugal, Europe

Bar, Bairro Alto, Lisbon, Portugal, Europe

Traffic in the Baixa area, Lisbon, Portugal, Europe

Funicular at Elevador da Bica, Lisbon, Portugal, Europe

Padrao dos Descobrimentos (Monument of the Discoveries) and Ponte 25 de Abil (25th April) bridge, over the River Tagus, Lisbon, Portugal, Europe

Modern art exhibition at Cultural Centre of Belem (Centro Cultural de Belem) art exhibition centre, architects Vittorio Gregotti and Manual Salgado, 1993, Belem, Lisbon, Portugal, Europe

Manueline ornamentation in the cloisters of Mosteiro dos Jeronimos (Monastery of the Hieronymites), UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Vasco da Gama Shopping Mall, Parque das Nacoes (Park of the Nations), Lisbon, Portugal, Europe