Mark Byrnes is a senior associate editor at CityLab who writes about design and architecture.
ScenePast lets you send a note with a classic 20th century streetscape from your mobile device. But it's also got an addictive second feature.
If you love sending classic postcards but never remember to actually mail them, you can (sort of) make up for it with a new $0.99 cent app.
"ScenePast Americana Road Trip" offers digital versions of over 500 20th century American postcards. Organized by location, users can get their nostalgia itch scratched rather easily.
The app allows you to send a digital "postcard" with your own message via email or social media. But by far the best feature is when you're ready to return to the 21st century, ScenePast lets you compare each old postcard image to the exact same spot as it appears today. For any 'then and now' addict, this is dangerous; the app lets you quickly travel the country in search of every town and city's most iconic spots and see just how much they have (or haven't) changed over the last century:
ScenePast Americana Road Trip is available at the iTunes store for $0.99.