The Crystal Empire is a prominent location in the northern part of Equestria, and is a city known to spread friendship throughout all of Equus. It is primarily inhabited by Crystal Ponies.
Layout
The Crystal Empire is a short walk away from the nearest train station. The homes of the Crystal Empire were all made up of a sort of crystalline material, most of which gave off a shine in the sun. A tall tower made up of similar material stood at the center of the city. The whole city is empowered by the Crystal Heart. In front of them, was a extremely shiny, clean, and very beautiful castle just ahead of them! The arch that leads to the castle was where made up of three magic-filled diamonds floating in mid air alongside red velvet crustal pillars.
It's considered very beautiful, enough to make the Crystal Gems speechless.
History
A long time ago, Sombra ruled over the Crystal Empire, enslaving much of the population. This got attention to Celestia and Luna, who promptly banished him to the frozen north. However, Sombra laid a curse on the empire that made both him and it disappear. It returned after thousands of years, and Sombra attempted another take over, this time being stopped by the Mane Six.
Season 1
It is revealed that it was the next place for the Equestrian Games to be taking motion in.
Season 7
Lars Barriga was brought there by Steven Universe and company for a vacation, as he was stressed out from bullying at school. At the same time Pink Diamond was brought there first, being put there by the other Diamonds for her own safety from White Diamond, and put under the Ponies' watch.