25 years old?
WIkipedia thinks it was established in 1604
http://en.wikipedia.org/wiki/Mosfellsb%C3%A6r
The good burghers of the Icelandic town of Mosfellsbær are unimpressed with local council plans to build a wild animal museum, and instead favour opening a vulva attraction. The campaigning Residents' Movement reckons a vulvular lipsmacker is a better way celebrating Mosfellsbær's "25th anniversary"* than the council's …
http://www.mosfellsbaer.is/Menning/Vidburdir/Mosfellsbaer25ara/
"9. ágúst árið 1987 varð Mosfellshreppur að Mosfellsbær. Af Því tilefni mun bærinn halda upp á 25 ára afmælið með margvíslegum hætti í samvinnu við íbúa, félög og fyrirtæki sveitarfélagsins allt afmælisárið."
I'd say a more popular attraction would be the heads of famous/infamous celebrities and politicians whereby you can throw rotten fruit and veg at them. Preferably the real heads and not fake wax types.
Or perhaps they could make and sell 'useable' versions of the vulvae in the form of fleshlights so you can try them out for yourself.
According to the infallible (or, at least, plausible) Wikipedia, there are no indigenous Icelandic animals, except the Arctic Fox (Polar Bears and bats blown off course are sporadic visitors). The others are domestic animals ferried over by the Vikings: sheep, cows, goats*, horses, mink, rabbits and dogs plus their commensals: mice and rats. Why anyone would wish to collect together an assemblage of their vulvas is left as an exercise for the reader.
* Insert inevitable goatse joke here.