Sister Sealand

Written by Icelandic composer Jón Leifs in 1964, the piece called Hekla, Op 52, requires four sets of rocks hit with hammers, steel plates, anvils, sirens, cannons and metal chains to play.

The Tornio/Haparanda course is the only two-nation golf course in the world, residing on the border of Finland and Sweden. Playing 18 holes means crossing the border 4 times.