Ravenclaws daughter hid the diadem in Albania
Voldemort dead shade form went to Albania
Quirrell went to Albania following rumors about voldemort.
Peter Pettigrew went to Albania to find voldemort.
Why did bertha jorkins go to Albania?
Why Albania? And if Quirrell could find voldemort voldemort was not hiding that hard.
It all stems from Helena Ravenclaw hiding the diadem in Albania. Voldemort went there to turn it into a Horcrux, so that place holds some importance to him. Eventually, Quirrell went snooping around looking for Voldemort's remains (assuming he knew where Voldemort was known to be last spotted, or was tracing the places where Voldemort used to be) when Voldemort overpowered him (think of Voldemort as a trap-door spider just waiting near the Diadem in wait). Pettigrew went a similar route, trying to find Voldemort when his animagus form was revealed (so he traced the places Voldemort went to as well).
Bertha was the outlier there - she merely went to Albania to meet her cousin, only disappearing afterwards when she's supposed to meet her aunt.