Can you even imagine how they pulled off building it? In my mind it's a miracle because I can't even conceive how they were successful in this endeavor.
Think about the fact that if you or I wanted to have a home built it would take around five months, so we'd be able to see it constructed and finished. In so many cases throughout history, beautiful structures such as these were never seen by the people who made it happen because they took decades, sometimes even over 100 years, to build. Amazing!