It's hard to imagine this planet without its biggest landmarks, from Sydney Opera House to the Statue of Liberty. But, of course, there was a time when they existed only as plans or blueprints, or in ...

Human beings have always built big, strange, and beautiful things to honor gods, kings, ancestors – or sometimes reasons we can only guess at. Archaeologists and historians can measure stones, date ...

SEATTLE — With its iconic, sail-like architecture, the Sydney Opera House is a world-famous landmark. The UNESCO World Heritage site is known for hosting various events from opera, ballet, symphony, ...