Hero skyline photos — Wikimedia Commons. Converted to black & white, darkened, resized/cropped.

chicago.jpg: "Skyline de Chicago desde el centro, Illinois, Estados Unidos, 2012-10-20, DD 06.jpg" by Diego Delso — CC BY-SA 3.0 — https://commons.wikimedia.org/wiki/File:Skyline_de_Chicago_desde_el_centro,_Illinois,_Estados_Unidos,_2012-10-20,_DD_06.jpg
new-york.jpg: "New York City at night HDR.jpg" by Paulo Barcellos Jr. — CC BY-SA 2.0 — https://commons.wikimedia.org/wiki/File:New_York_City_at_night_HDR.jpg
los-angeles.jpg: "Los Angeles Skyline; August 30, 2022.jpg" by ItzAPotato2009 — CC0 — https://commons.wikimedia.org/wiki/File:Los_Angeles_Skyline;_August_30,_2022.jpg
kansas-city.jpg: "Kansas City, MO skyline at night.jpg" by Lasse Fuss — CC BY-SA 3.0 — https://commons.wikimedia.org/wiki/File:Kansas_City,_MO_skyline_at_night.jpg
phoenix.jpg: "Downtown Phoenix Skyline Lights.jpg" by Alan Stark — CC BY-SA 2.0 — https://commons.wikimedia.org/wiki/File:Downtown_Phoenix_Skyline_Lights.jpg
dallas.jpg: "Fountain Place Tower in Dallas Texas with A Dramatic Sunset.jpg" by Matthew T Rader — CC BY-SA 4.0 — https://commons.wikimedia.org/wiki/File:Fountain_Place_Tower_in_Dallas_Texas_with_A_Dramatic_Sunset.jpg
atlanta.jpg: "Jackson Street Bridge and Atlanta Night Skyline (Unsplash).jpg" by Joey Kyber jtkyber1 — CC0 — https://commons.wikimedia.org/wiki/File:Jackson_Street_Bridge_and_Atlanta_Night_Skyline_(Unsplash).jpg
miami.jpg: "Miami, Florida skyline.jpg" by Wilfredor — CC0 — https://commons.wikimedia.org/wiki/File:Miami,_Florida_skyline.jpg