I've only ever trained as a boxer, have you trained with any fighting styles?
I have never trained in any fighting styles although I understand Krav maga is known for focusing on real-world situations.
That's what I've heard also.  I am interested in learning further about Krav Maga, perhaps even take a lesson.
It was developed for the Israel Defense Forces and it's a combination of boxing, wrestling judo and other styles.
Wow! At least it includes boxing.  Do Krav Maga gyms usually offer the first lesson free?
I am not sure about what the gyms charge but I know it has a philosophy which emphasizes aggression and offensive maneuvers.
Interesting, I hope the training isn't super unsafe.  Even though with whatever fighting style you practice, there's always a chance for injury.  How long has this fighting style existed?
use of his training as a boxer and wrestler while defending the Jewish quarter against fascist groups in Bratislava, Czechoslovakia, during the mid-to-late 1930s. In the late 1940s, following his migration to Israel, he began to provide lessons on combat training to what was to become the IDF.
From the outset, the original concept of Krav Maga was to take the most simple and practical techniques of other fighting styles (originally European boxing, wrestling, and street fighting) and to make them rapidly teachable to
Krav Maga
Krav Maga (; , "lit." "contact combat") is a military self-defence and fighting system developed for the Israel Defense Forces (IDF) and Israeli security forces derived from a combination of techniques sourced from boxing, wrestling, aikido, judo and karate, along with realistic fight training. 
Krav Maga is known for its focus on real-world situations and its extreme efficiency. It was derived from the street-fighting experience of Hungarian-Israeli martial artist Imi Lichtenfeld, who made