A looming skyscraper, once an exclusive residential complex, turns into a dystopian ruin in Johannesburg, South Africa; experts investigate and uncover a symbolic structure of urban decay under the shameful shadow of apartheid. Stories: 1) Ponte City, Johannesburg, South Africa; 2) Bonanza, Idaho; 3) Campanopolis, Argentina; 4) Castle Frankenstein, Mühltal, Germany