What do Prada and Julius Caesar have in common?How have Gucci and Moschino shaped Rome's hippest streets?Art historian Laura Flusche and architect Susan Sanders have created a company called Urban Iconography: The Institute of Design & Culture, which explores these and other historical and contemporary issues in guided walks around Rome. Among the greatest hits: "The Not-So-Rough Guide to Rome," which looks at the culture of shopping and tourism, from chic Via del Babuino to the Spanish Steps; "Tosca Tumble," a whirl around sites from Puccini's opera; "Rome-ancing the Stones," which examines the effects of the Forum and the Colosseum on today's city. Also in demand are made-to-measure itineraries, requested by the likes of Nobel Prize—winning writer V. S. Naipaul. So what do Caesar and Prada have in common?"They both rule by design," Sanders says. Urban Iconography, 214/853-5603; www.urban-iconography.org; from $170 for two hours.—V.W.