The Chapel Oak,_sea_and_sky,_or,_Marvels_of_the_universe_(microform)_-_being_a_full_and_graphic_description_of_all_that_is_wonderful_in_every_continent_of_the_globe,_in_the_world_of_waters_and_the_starry_(20444354449).jpg

In 1696 lightning struck an oak in Normandy, and the resulting fire hollowed out the tree. Villagers filled the space with two chapels, reached by a spiral staircase that circles the trunk. Now perhaps a thousand years old, the Chêne chapelle is still in use today.

See Al Fresco.