Libeskind drove a pointed steel and glass shard through the skin of the historic museum to create new galleries on five floors and a 30 metre-high rooftop viewing platform.
When we originally published the story, many readers were outraged with the design, with one commentor suggesting it to be like a giant axe cutting through the building.
Critics also had a lot to say. Architecture journalist Rowan Moore described the building as both "breathtaking" and "breathtakingly dumb", while critic Mary Lane compared it to "a piece of shrapnel freshly fallen from the sky" - read more about the critics opinions here.
Another controversial museum we've published recently is the heavily criticised Museum of Liverpool - read more about that project here.
See also: more stories about museums.