Conversation so far:
when did the sydney opera house became a world heritage site
On 28 June 2007 the Sydney Opera House was included on the UNESCO World Heritage List under the World Heritage Convention
who is the architect of the sydney opera house
Jørn Utzon is most notable for designing the Sydney Opera House in Australia.

Question: what are the architect's other noteworthy works
Self-contained rewrite: what are jørn utzon's other noteworthy works besides the sydney opera house