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LISBON, PORTUGAL - JUNE 09: Visitors crowd the Miradouro das Portas do Sol, a much favored observation spot by tourists, on June 09, 2019 in Lisbon, Portugal. The number of foreign tourists visiting Portugal is edging up to break another record in 2019, and Lisbon, according to the rating agency Moody's, has become the city with the highest ratio of property to rent to visitors with more than 30 dwellings per thousand inhabitants, compared to the main European capitals. (Photo by Horacio Villalobos#Corbis/Corbis via Getty Images)

LISBON, PORTUGAL - JUNE 09: Visitors crowd the Miradouro das Portas do Sol, a much favored observation spot by tourists, on June 09, 2019 in Lisbon, Portugal. The number of foreign tourists visiting Portugal is edging up to break another record in 2019, and Lisbon, according to the rating agency Moody's, has become the city with the highest ratio of property to rent to visitors with more than 30 dwellings per thousand inhabitants, compared to the main European capitals. (Photo by Horacio Villalobos#Corbis/Corbis via Getty Images)