This seems to be a question of opinion (although I guess you could find out through statistics) but I'm going to say probably the Parthenon in Athens
What is the most popular landmark of portugal
The most popular landmark in Madrid is the Plaza Mayor.
Table mountain is widely regarded to be the most famous and popular landmark. The most popular man made landmark might be the 'Kimberly Hole' diamond mine?
Australia's most popular landmark is Ayers Rock, or Uluru, in the Northern Territory Outback.
The fjords.
The Parethean is a landmark in Greece.
The Acropolis is Greece's most famous landmark. It is an exceptionally beautifull (architecturally) complex of Ancient Greek temples.
farts in the tolite with turds
Yes. It is one of the most popular sights.
Diamond Head and the Aloha Clock Tower.
Mousaka!
Crete