Lots of people sharing their tour anecdotes, but I wanted to add: my favorite part of the experience is when they take you inside the "lungs". Due to the immen

Lots of people sharing their tour anecdotes, but I wanted to add: my favorite part of the experience is when they take you inside the "lungs". Due to the immense amount of atmosphere inside, they needed a way to handle the expansion and contraction over the course of the day, so they built a giant diaphragm roof that can raise and lower on top of an auxiliary dome. During the tour they take you inside to see it inflated, then take you into the outer shell and crack a door so you can watch the whole thing collapse. Super simple mechanism, but it really hit home the complexity of the problem space.