Possible Clues:

• Home of the Vasco da Gama Bridge, over 7.5 miles long
• Capital home to the Rua Augusta Arch
• A lot dropped by balloonist on the Iberian Peninsula
• City struck by the earthquake discussed in Voltaire's Candide
• Westernmost capital on the European mainland
• Portuguese city
• Large bison on the loose in the city
• Capital on the Atlantic coast
• Slob in Portuguese city
• Pound is good in France? Euros needed here!