Kigali Rwanda's highest buildings, including the 20-storey Kigali City Tower, are located in the CBD, as are the headquarters of the country's largest banks and businesses. Other buildings in the CBD include the upmarket Serena, Marriott and Mille Collines hotels, the University Teaching Hospital of Kigali, the national university's College of Science and Technology, and government buildings such as the National Bank of Rwanda and the Ministry of Finance and Economic Planning. To the south west of the CBD, and also on the Nyarugenge Hill, is the suburb of Nyamirambo. This was the second part of the city to be settled,
Kigali matatus to bigger city buses, which are connecting the most important sectors. These buses use a cash-free payment system called Tap&Go. In 2017, matatus were still used to connect the more remote areas of the city. In contrast to the national express buses, these services wait to fill up before setting off from the terminus, then pick up and drop off frequently en route. Kigali has many taxis (known as 'special hire' or 'taxi voiture'), which are generally painted white with an orange stripe down the side. Even more popular are motorbike taxis ('taxi moto'), which offer a service similar