St. Mary's Cathedral, Perth (must see)

Saint Mary's Cathedral is a Roman Catholic cathedral in Victoria Square. It replaced the colony's first Roman Catholic church, Saint John's. The cathedral was designed by Joseph Ascione in the Norman Gothic architectural style.

The cathedral was constructed in three phases. The primary structure was completed in 1865. The second construction, completed in the 1920s, added a new transept and sanctuary. Mosaics in the sanctuary were patterned after designs from the Book of Kells. New stained glass windows were added, designed by John Hardman of the United Kingdom.

The final construction increased the size of the cathedral, added a second spire and included an underground parish center. During construction, the remains of the first bishops of Perth were found beneath the cathedral's floorboards. A permanent crypt for these bishops was then added to the architectural plans.

This construction was completed in 2009. The new design of the cathedral won three architectural design awards for its architect Peter M. Quinn.