It depends what part of the city you're in. Places close to favelas are very dangerous.
Brazilian people can recognize a tourist very easy (by clothes you use, skin tone and accent). Try to find out where the middle - high class people go. Some places in Rio de Janeiro, Sao Paulo, Recife and Brasilia are the most dangerous.
SouthEast of Brazil in São PAulo City
The Amazon rainforest is the most dangerous jungle when taking into consideration the predators that live there. This jungle is in Brazil. Peru, and Ecuador.
Frankfurt is the most dangerous, relating to crime.
Toledo Ohio is the 27th most dangerous city in America. (2010)
Camden is one of the most dangerous in the country if not the most. Newark is also one of the most dangerous
São Paulo
Sydney is more likely to be the most dangerous city in Australia because there can be a lot of crime there, avoid Kings Cross in Sydney. It's the most dangerous place in Sydney!
Brasilia is the capital of Brazil. The coordinates for this city are 15.7989 degrees S, 47.8667 degrees W. Brasilia is the fourth most populated city in Brazil.
Badajoz
electricity
Rio de Janeiro
columbia is the most dangeruos city in south america.