Imperial Vault of Heaven
On the grounds of the Temple of Heaven, is the Imperial Vault of Heaven. It's a particularly noisy area compared to the rest of the site due to the Echo Wall which is purportedly able to transmit sounds over a distance. Much screaming/shouting takes place to test this claim.
In this shot is Cindy walking back from the other side of the Echo Wall which surrounds the vault. If she looks annoyed, it's because we had just tried in vain to test if we can hear each other from opposing points on the circular wall.