Drusselstein

Druelselstein is the fictional German state of Dr. Heinz Doofenshmirtz, who lived in the village of Gimmelschtump. It appears to be a parody of countries like Germany, Austria, Hungary, Transylvania (Romania) and Switzerland.

Location
Druelselstein was referred to as "the old country" by Reginald Fletcher, which generally indicates a European country like Hungary, Romania, or going further back, Transylvania. ("The Monster of Phineas-n-Ferbenstein".) In another episode, many people claim Doofenshmirtz had "some kind of a German accent", implying that Druselstein is in Germany, possibly one of the many states (such as Bavaria, Prussia, Brandenburg, and Hessy)

People
The people of Druelselstein live a very urban lifestyle. Children in Gimmelschtump like to play games such as Kick the Schtumpel, and other sports include Poke the Goozim with a Stick, and also baseball, as there is a Druelselstein minor league baseball team. There are also many skill cranes in Gimmelschtump, which mostly contain rocks. Pastry delicacies include Doonkleberry cake and Doonkleberries. The state still retains figurheads as head of state, including Princess Baldegunde. While most of the time, the people are happy (albeit except for Heinz Doofenshmirtz), poverty still exists.

Beliefs
The people have a strong belief in black magic. As a tradition, lawn gnomes are placed in front of each house to ward it off. When lawn gnomes become repossessed, parents appear to do anything to make up for it, even making their children dress up as one. Their beliefs are so strong that Heinz had to let his best friend Balloony go because his father told him to stand still.

It is also possible that they belived in ghosts and Princess Baldegunde exclaimed "You are my Doppelganger!!" as soon as they met. As it is a German country, the state religion is most likely Christianity. It could either be Catholic or Lutheran depending on where in Germany it is.

Language
The people of Druelselstein speak German; for instance, when young Doofenshmirtz is instructed not to move in a flash-back in "Lawn Gnome Beach Party of Terror", he was told, "Bewegen dich nicht", which is German for "Don't move!" or "Das Kind ist ein Schnitzel!" ("The kid is a Schnitzel") and "Zu nah!" ("Too close!") in "Split Personality".

Otherwise, characters generally speak English, such as the Gunther Goatcheese's employee who tells the young Heinz to lock up after his party is over ("Raging Bully"), but that was probably not meant as if the populace spoke English, but is rather used for convenience's sake and because it has no direct comedic use as opposed to the former example.