I've been reading a little bit about him, but I'm having a hard time learning any specific details. All I can find is very brief information that basically says "he was gay, he was insane, he was killed, he built castles." But I want to know more. How do they know that he was homosexual? Whats specifically did he do that made him insane? Did he think people were out to get him? Why did he have those castles built? And what are the mysteries about his death?
There was a documentary on BBC 4 that dealt with this, tracking his life and the castles he built.
https://www.youtube.com/watch?v=Lf4wTQxAaMQ&feature=youtube_gdata_player
It's been a few months since I've watched it but the castles are thought to be a part of his escapism from the realities of the loss of power Bavaria saw as Prussia moved towards unifying Germany. As well as this is his love of opera (specifically Wagner) and German mythology. The documentary is very interesting and covers much of his life and the castles he built. The castles put him in a lot of debt and if I remember right adjusting for inflation it is roughly €3 billion.
This documentary is all I really have learned about him but it covers the questions about his homosexuality and death to some degree. Sorry if this isn't enough but I do highly recommend it if you can get all the parts
Fairly good book on the subject - http://www.amazon.com/The-Dream-King-Ludwig-Bavaria/dp/0140036067