 The dome creates an impressive rotunda in the building's interior, which is visited by up to 300 people a day during the summer season.Shortly after the building's completion in 1911, the dome's skylight began to leak, causing serious problems during the heavy rains regularly experienced in the Northwest.The skylight was eventually covered over, but the leakage—and the structural and cosmetic damage it caused—continued, growing more severe in the decades that followed.