Original: Lightning can damage structures made of most materials (masonry, wood, concrete and even steel) as the huge currents involved can heat materials, and especially water to high temperatures causing fire, loss of strength and explosions from superheated steam and air.
Simplified: Lightning can damage structures made of most materials (masonry, wood, concrete and even steel). The huge currents involved can heat materials, and especially water to high temperatures. This will cause fire, loss of strength and explosions from superheated steam and air.