30 St Mary Axe (widely kent informally as "the Gherkin" an previously the Swiss Re Biggin) is a skyscraper in Lunnon's main financial destrict, the Ceety o Lunnon, completit in December 2003 an opened in Aprile 2004. Wi 41 fluirs, the touer is 180 metres (591 ft) taw an stands on a street cried St. Mary Axe, on the umwhile steid o the Baltic Exchange, which wis extensively damaged in 1992 bi the explosion o a bomb placed bi the Provisional IRA.