Yggdrasil

"'I PRESENT TO YOU, EMPEROR, AN UNBEATABLE FORTRESS. UNTOUCHABLE BY THE HANDS OF MAN!' - General Silze II (1698)"

It is commonly agreed that Yggdrasil should not be real. It is in fact theorized that it is not, simply because it seems as impossble as it sounds.

Sadly Yggdrasil is real. As well as the Capital of *kingdom*, as well as genius strategy base as well as a high level prison.

Background
Yggdrasil was first dreamed of in 1680 by the Legendary General (later emperor) silze II.