A hacked traffic light honks at drivers the instant the signal turns green.
It must sting when the world's biggest smog-hole is calling your air polluted.
The city banned half of all cars from the roads on Monday. Will it be enough?
The entire Paris region's public transportation system will be free this weekend in an effort to stem the early spring smog.
Transit "branding," from a system's logos to its stations, can have a real impact on riders.
Can one of the world's most famous historic churches hold up to modern-day lighting?
Don't even think about wearing a hoodie and pajamas to the fashion-themed "épicerie."
Swimming pools in the Seine, restaurants in old metro stations, and more.
Sniffing around a new Bay Area exhibit devoted to the smells of places from the modern day to the Middle Ages.
Ideas for putting the city's "ghost stations" to good use.
But balancing quality and cost is no easy task.
The world's most beautiful city just keeps getting attacked in the English language press.
Alas, city transport bosses do not seem to have enjoyed this stunt as much as their riders.
Courtesy of a new book of drawings.
Memorials and tributes to the South African icon, from Soweto to Brooklyn.
France has just made buying sex illegal, and the rest of the continent will be watching.
Photographer Janol Apin shoots playful scenes along the platforms.
How highway interchanges become beautiful color-coded open-source maps.
A hostage was also reportedly taken on the Champs-Elysees.