The Procuratie Vecchie, located in St. Mark's Square, is one of the most famous (and mysterious) buildings in the Italian city. For the first time in its history, it opened its doors to the public.

According to CNNquoted Zap aeiou, the building was built in the early 1500s. The 150-meter neoclassical facade is one of Venice's most famous images.

The doors of this Renaissance palace have been open to tourists from all over the world since April 13. Visitors can now access its fourth and top floor, where an exhibition has been installed.

The building had been the former headquarters of the Italian insurance company Generali since 1832, but underwent a five-year renovation led by architect David Chipperfield.

The company has kept offices on the second floor and will lease the third floor (including for exhibitions, which will be open to the public). The fourth floor will become the headquarters of The Human Safety Net, a project that helps people and families at risk, including refugees.