The cathedral interior is pure 13th Century English Gothic. Two kinds of limestone grace its walls and pillars: Indiana Limestone and Ontario Credit Valley Limestone. Its vaulted ceiling, with gold bosses, is a direct copy of Norwich Cathedral in England. It also has seating for over 1000 parishioners in the nave and 200 in the Sanctuary area, with television flat screens installed on the side Indiana limestone columns for blind spots. The left side altar with its magnificent large painting of Christ's entry into Jerusalem on Palm Sunday, contains the holy oils in three gold urns. The right side altar contains a massive painting of the Nativity Scene and a mosaic of the Eastern Catholic Churches: Our Lady of Perpetual Help. A large 88 ton marble Ciborium, sometimes erroneously called a Baldachino, in the shape of a crown, the symbol of a royalty and kingship, graces the north end of the cathedral over the tabernacle. Although this is not a normal feature of Gothic architecture, its Gothic design blends in perfectly with the architectural style of the Cathedral. The major patriarchal basilicas in Rome, namely, St. Peter's, St. Paul Outside the Walls, St. John Lateran Cathedral and St. Mary Major, all have a ciborium over their altar of sacrifice.