I don't know if any of my choices would be considered
"incredibly beautiful" as the thread title suggests, but......Back in 2005 and prior I would have said the Villa De Chantal school (1901) a few blocks from my home. Me and Virginia loved to walk the dog on the grounds of this place, especially after dark but it burned to the ground (arson?) in July 2005...
So my current choice(s) are the Kelly house (1892) just down the block from me. The orginal owner was Frank Kelly, partner to Rock Island gangster John Looney whos home is next door. The 2002 movie
Road to Perdition was based on the John Looney character......
.....And on the other side of my neighborhood, a place with unparalleled views on the edge of the bluff and can be seen for miles down the river valley is Steepmeadow Apartments (condos) Built between 1960 an 1962, designed by the firm of Skidmore, Owings and Merrill..
