This year's themes for one of Switzerland's oldest traditions include artificial intelligence and the Barbie movie.
ADVERTISEMENTAbout 11,000 people have participated in the opening day of Switzerland's largest carnival in Basel.
At 4am on Monday, street lights went out and colorful lanterns were lit. Many spectators followed the parade through the streets of the city's historic centre, crossing the Rhine and continuing into the night.
This year's themes for the Basler Fasnacht Carnival include artificial intelligence, the latest Barbie film and various current political issues.
The carnival tradition in Basel dates back to 1376, and has been recognised by UNESCO as a part of Switzerland's cultural heritage.
This year's event is set to go on till Wednesday.
