By completing 450 years on Sunday, the Rio de Janeiro records and advances faces challenges that have dragged on for decades.
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The former capital, considered Brazil's postcard to the world, has a tourist market that is still growing, but still faces basic sanitation problems, violence, urban mobility and tourism infrastructure.
A little more than 500 days of the Olympics, Rio is a big construction site, with expansion of the subway, building BRT (bus lanes), VLTs (surface trams), tunnels and duplication of roads, besides the Olympic venues.
The BBC Brazil selected five areas and invited experts to review the current problems and future challenges of the city.
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