Nova (8 p.m., PBS/Ch. 7): Bricklayers build a mini-Duomo to try to figure out how Filippo Brunelleschi built the dome of Florence's great cathedral of Santa Maria del Fiore.
Super Fun Night (8:30 p.m., ABC/Ch. 4): ABC is wasting original episodes of any of its shows against the Olympics tonight … with the exception of this one. Because this really bad sitcom isn't going to be around for long anyway.
Super Skyscrapers (9 p.m., PBS/Ch. 7): A look at the Leadenhall Building, the tallest skyscraper in London.