While it’s fairly clear that the building in the picture above is a chapel, what is not so obvious are the materials used in its construction. Are the walls built with brick or stone and then rendered with colored plaster? Does the building have a green roof of plants and grasses covering tiles? In fact this has been constructed entirely from trees which have been grown to form this shape. As this article which I found on the Gardening Channel explains Barry Cox from New Zealand spent four years building his chapel from live trees.

New Zealand man spends 4 years building chapel from live trees ? and it is beautiful

He had traveled the world and seen his share of beautiful churches. So?Barry Cox of Ohaupo, New Zealand decided that he would construct his own chapel?made of living trees ? big enough to seat 100 people!

It took four long years of hard work planting more than 4,000 trees, but Cox ended up with?a wonderful church set on three acres of surrounding, magnificent gardens. He used a huge, specially designed tree spade ? a giant machine that is big enough to move entire, full sized trees.
 

He even created a labyrinth for walking meditation.

See more at the Gardening Channel