Shigeru Ban's 2013 temporary Christchurch cathedral after the earthquake — paper tubes structurally.
From Wikipedia
The Cardboard Cathedral, formally called the Transitional Cathedral, in Christchurch, New Zealand, is the transitional pro-cathedral of the Anglican Diocese of Christchurch, replacing ChristChurch Cathedral, which was significantly damaged in the 2011 Christchurch earthquake. It is located on the site of the former St John the Baptist Church on the corner of Hereford and Madras Streets in Latimer Square, several blocks from the permanent location of ChristChurch Cathedral.