Australia is my favorite country. Some highlights include the Sydney Opera House, known for its distinctive modern expressionist design featuring large precast concrete shells forming the roofs. The Great Barrier Reef is the world's largest coral reef system located off the coast of Queensland, where one can swim and go diving among many fish, coral reefs, and starfish. The Lone Pine Koala Sanctuary is the oldest and largest koala sanctuary in the world, home to over 130 koalas that visitors can hug, along with kangaroos and emus.