Lisbon's name may have been derived from Proto-Celtic or Celtic Olisippo, Lissoppo, or a similar name which other visiting peoples like the ancient Phoenicians, Greeks and Romans adapted accordingly, such as the

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Origins
During the Neolithic period, the region was inhabited by Pre-Celtic tribes, who built religious and funerary monuments, megaliths,

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Physical geography
Lisbon is located at 38°42′49.75″N 9°8′21.79″W / 38.7138194°N 9.1393861°W ,

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The historical population of the city was around 35,000 in 1300 AD. Up to 60,000 in 1400 AD, and rising to 70,000 in 1500 AD. Between 1528 and 1590 the population went from 70,000 to 120,000. The population was about 150,000 in 1600 AD, and almost 200,000 in

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The Lisbon region is the wealthiest region in Portugal and it is well above the European Union's GDP per capita average – it produces 45% of the Portuguese GDP. Lisbon's economy is based primarily on the tertiary sector. Most of the headquarters of

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Metro
The Lisbon Metro connects the city centre with the upper and eastern districts, and also reaches some suburbs that are part of the Lisbon metropolitan area, such as Amadora and Loures. It is the fastest way to get around the city and

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The city of Lisbon is rich in architecture; Romanesque, Gothic, Manueline, Baroque, Modern and Postmodernconstructions can be found all over Lisbon.

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