The cityscape of Bulgaria's capital has changed dramatically since 1989. But the building boom has paid scant regard to either regulations or the city's distinctive architectural heritage. And upcoming projects might well disfigure the city forever, as is shown on a 3D map created by Boyan Yurukov, an open-data activist.

In Spain, the housing crisis has a particularly strong impact on religious and ethnic minorities, for whom access to housing is even more difficult. The systemic discrimination they suffer can cause serious damage, says Bianca Carrera.