Science North is an interactive science museum in Greater Sudbury, Ontario, Canada. The complex, which is Northern Ontario's most popular tourist attraction, consists of two snowflake-shaped buildings on the southwestern shore of Ramsey Lake, just south of the city's downtown core, and a former ice hockey arena which includes the complex's entrance and an IMAX theatre. The snowflake buildings are connected by a rock tunnel, which passes through a billion-year-old geologic fault. This fault line was not known to be under the complex during the construction of the building in the early 1980s. Where the walkway reaches the larger snowflake, the Inco Cavern auditorium is frequently used for temporary exhibits, press conferences, and other gala events by Science North and the wider community.