This icon set was finished in 2015. The purpose was indicate where were the different company offices.
From left to right and top to bottom:
Vigo - 'Co-Cathedral of Santa Maria de Vigo'
Barcelona - Basilica and Expiatory Church of the Holy Family
Madrid - 'House of Carnage'
London - Palace of Westminster
Mexico DF - 'Mexico City Metropolitan Cathedral'
Miami - 'Miami Tower'