Depiction in films
In My Little Pony Equestria Girls, the Crystal Empire is the venue for a "princess summit." During this time, Sunset Shimmer uses the Crystal Mirror (that once resided in Canterlot Castle, but was moved to the Crystal Castle) to sneak into Twilight Sparkle's room and steal the element of magic.
The square lies at the centre of the Empire, where the Crystal Castle is located. In the series, it is depicted as a peaceful place with a lot of buildings and working Crystal Ponies.
There is a snowflake pattern on the ground, spreading out from the Crystal Heart.
The Crystal Castle is the home of the royal rulers of the empire. It has a huge crystal tower which fires a ribbon of energy into the sky whenever the Crystal Heart below is powered.
During King Sombra's rule, the Crystal Castle had a much darker appearance and strongly resembled Barad-dûr from The Lord of the Rings.
The Crystal Empire is home to an immense library with decorative griffon statues outside its front doors.