Danish architect Jørn Utzon never really revealed the inspiration for his modern, striking design of the Sydney Opera House. Some see sails, others shells, or palm fronds—whatever you see, it is a masterwork. Notably, Utzon resigned his position overseeing the project some seven years before it was completed, over disagreements about the practicality and cost of his design. 

Once you’ve taken in the Opera House from afar and up close, where you can see the stunning mosaic patterns of the tiles, there are plenty of surprises in store. Here are some of our favorites, from a historic observatory to a statue of an adventurous, seafaring feline.