Canterlot Castle

"What a disgusting tribute to the wealth of those who rob the poor, the blind, and the crippled." - Sorrel Marx
Canterlot Castle is "The capitol of the capitol of Equestria." It is the splendid, massive construction that overlooks Canterlot Valley, where the rest of the actual city was built. The castle houses a huge amount of soldiers, wealthy citizens, and government officials. Most foreign embassies are built inside of the castle.

While many prominent communist party members and communist leaders call Canterlot Castle "A tribute to the wealth of those who rob the poor, the blind, and the crippled," it is rather a tribute to the success of free-enterprise capitalism. The castle was only built after years and years, in 64 E.F, of the success Equestria's economy experienced from selling natural resources to other countries and from Equestria's own internal economy. Before the castle was built, the monarchs, Horizon and Venus along with the other goverment officials of the time, ruled Equestria from a capitol building in Canterlot Valley. They relocated once the castle was built. The old capitol building is now an exhibit open to the public.

Inside the castle itself is one of the three locations where White Army soldiers are trained. There are large rooms inside of the castle that are much, much bigger on the inside than they are on the outside, made possible by very powerful magic. White Army trainees are isolated inside these rooms, some of which are tens of miles big on the inside, for months on end during their training.

Security measures
In the event of a natural disaster or war, Canterlot Castle has very special rooms that could hold thousands of people each, commonly referred to as "dungeons." These rooms are magically enchanted to have more room inside of them than they should. None of these rooms have been used for the purpose of disaster relief, yet. Canterlot uses rooms like those to store stockpiles of food and other crucial supplies, like ammunition. (All kept from aging or rotting with magic.)

The castle is imbued with literally millions of different overlapping spells that protect it from, of course, many different forms of attack or invasion. The actual city in Canterlot Valley has the same spells along a main route through the entire city that would protect anyone trying to reach the castle in the event of a sudden attack or natural disaster.