Monadnock Building (1891) One of the first buildings I think of when dealing with walls, the Monadnock Building. It was, and I believe still is, the tallest building with load-bearing masonry walls. To accomplish this the walls are 6 feet thick at the base and taper to a foot and a half.
In 1951, modernist architect Oscar Niemeyer designed and built his own residence, Casa das Canoas, in Rio de Janeiro, Brazil. “My concern was designing this residence with full freedom, adapting it to the uneven terrain, without altering it, making it into curves, so as to allow the vegetation to penetrate them, without the overt separation of the straight line.” - Oscar Niemeyer