This week, the Principality Stadium celebrates its 20th birthday.
A whole generation of people have no idea what Cardiff or its skyline used to look like without those four iconic spikes protruding through the surrounding buildings.
Those born after a certain date may be surprised to learn that, up until 1969, Cardiff RFC and Wales used to share a stadium - the original Cardiff Arms Park.
It was then that the National Stadium project was conjured up, that would involve the construction of a new stadium on the same site, with the Arms Park - as we know it now - being built on a cricket ground next to the original.
The National Stadium was completed in 1984 and was officially opened.
However, just a decade later it was no longer fit for purpose and its capacity had fallen behind competing European stadiums.
By 1995, it was decided a new national stadium, with increased capacity and better facilities was required.
It would be built on the same site as the old national stadium.
In order to make room for the new stadium, it's increased capacity and the mechanisms that would support a retractable roof, it had to be rotated 90 degrees and a number of surrounding building destroyed.
Buildings including the Wales Empire Pool, Cardiff Empire Telephone Exchange, the Territorial Auxiliary & Volunteer Reserve Building and the Social Security offices were all demolished.
And a £6 million river walk overhanging the River Taff was required to ease access on that side of the ground.
It was completed just in time to host the 1999 Rugby World Cup opening ceremony and has been hosting huge occasions ever since.
You can read the remarkable story of how the Principality Stadium was built, the building giant it financially crippled and
The gallery below shows all the remarkable images of the national stadium, from the demolition of the old Cardiff Arms Park to the building of the arena as we know it today.
