5 Abraham Lincoln Tower Rio de Janeiro, Brazil
Abraham Lincoln Tower (aka Torre Abraham Lincoln) is one of two towers in Rio de Janeiro that were part of a massive development plan in the 1960s. The project aimed to build 76 residential towers, but only two were built.
The designers were Lucio Costa and Oscar Niemeyer, the two men who designed Brasilia, the capital of Brazil. Construction on Torre Abraham Lincoln began in 1969 but was halted in 1972 due to concerns about structural integrity. It was never finished.
However, its twin tower, known as Torre Charles de Gaulle, sits fully finished and occupied right next to it. Torre Charles de Gaulle is almost like a picture of what Torre Abraham Lincoln could have been.