(I received the card from Aga and Greg - Australia)
The reference cited hierein
“Sydney Opera House stands by itself as one of the indisputable
masterpieces of human creativity, not only in the 20th century but in
the history of humankind” (International Council Report on Monuments and
Sites to the World Heritage Committee).
On 28 June 2007 the Sydney Opera House was included on the UNESCO
World Heritage List under the World Heritage Convention, placing it
alongside the Taj Mahal, the ancient Pyramids of Egypt and the Great
Wall of China as one of the most outstanding places on Earth.
It is the youngest cultural site to ever be included on the World
Heritage List and one of only two cultural sites to be listed during the
lifetime of its architect, Jørn Utzon (1918-2008).