SkyScraperPage.com has an amazing feature: a searchable database of world’s tallest building diagrams. There are pre-sorted direct links to groupings of buildings by city, continent, and architect. The search parameters let you create your own unique groupings and sort them in various ways. The illustrations are exceptionally detailed. My own subtitles for a few: Vienna, “old versus new”. San Jose, “no upstaging”. Wuhan, “1997, year of the instant skyline”. and Miscellaneous, “The Titanic?”