I hope that fans of Terroir don't call themselves Terroirists.

Sparkling shiraz has a famous home at the beginning of the main Hunter Valley (NSW, Australia, near Sydney) wine trail:

Peterson's Champagne House
A different house from the House of Miles and obviously not a house of Petersen, but it's a landmark and a must-see for anyone going to the Hunter Valley and interested in sparkling - especially sparkling shiraz.

(don't ask about the French terroir-ists wanting Petersons to drop the C word! )

There are a ton of discussions in the Australia forum if anyone has questions or want to read about wine in Australia. In terms of drinking it, there are plenty of options for visitors and many Oz FTers are happy to help!