Ответ:

1. The Almaty Metro opened on December 1, 2011.

2. Every station of the Almaty metro is unique because each station has its own theme and design, showcasing the culture, history, and traditions of Kazakhstan. The stations are decorated with mosaics, sculptures, and other works of art, making them not only functional transportation hubs but also cultural landmarks.

3. Black cab drivers in London need to obtain the "Knowledge of London" certificate, which is essentially an exhaustive test of the driver's familiarity with all of the streets and landmarks of London. The driver must pass a series of oral and written exams and must know over 25,000 streets and 20,000 landmarks within a six-mile radius of Charing Cross.

4. It is difficult to give an exact number of streets in London because it is a constantly changing and evolving city. However, according to the London A-Z street atlas, there are over 40,000 streets in Greater London.