I love Sydney. I ended my stay with a 2-hour powerwalk in one of my favorite venues anywhere in the world—the Royal Botanic Gardens and Domain. Above you'll see one of the gardens' century plants in bloom—they can grow several feet in a day when they explode from their dormancy. (I thought one was an intruder years ago, when it appeared instantly outside the window of my San Francisco house.) Below "the mother of all trees."