TIL: London–Calcutta bus service - Wikipedia
The bus service from London, England to Calcutta, India (now Kolkata) is considered to be the longest bus route in the world. The service, which was started in 1957, was routed to India via Belgium, Yugoslavia and North Western India. This route is also known as the Hippie Route. According to the reports, it took about 50 days for the bus to reach Calcutta from London. The voyage was over 10,000 miles (16,100 km) one way and 32669 km (20300 miles) for the round trip. It was in service until 1976.