City Hall of Stockholm, Sweden

The City Hall of Stockholm is located in the center of the Swedish capital. The 106-meter-high tower is topped by the three crowns that symbolize the country’s regions. The grand-opening took place on June 23, 1923, after twelve years of construction. Skanska, which was responsible for the building’s concrete structure, is the only company involved in the project that is still in business 90 years later.