The Slovak Radio Building in Bratislava, Slovakia actually consists of two inverted pyramids.

An inner pyramid contains recording studios and broadcasting equipment, insulated from external sounds, for Slovakia’s national public radio service. The outer pyramid is used for office space. In addition, the building houses a concert performance space with 522 seats and one of the largest pipe organs in central Europe.

Architects of this project were Štefan Svetko, Štefan Ďurkovič and Barnabáš Kissling. Construction on the Slovak Radio Building started in 1967, and it took over 16 years to complete. The first test broadcast was made in 1984 and regular broadcasting began on 27 March 1985. The Slovak Radio Building was one of the first major buildings in Slovakia to use steel frame instead of the ubiquitous prefabricated concrete panels of the era.

The distinctive building has divided public opinion ever since its unveiling. While some (including architects) consider it one of the country's most important buildings, conversant with contemporary architectural styles in the world, others consider it ugly and synonymous with communist oppression.

Public opinion aside, in 2017 the building was declared a cultural heritage monument in Slovakia.

More Info: en.m.wikipedia.org