Why do radio waves diffract around buildings, while light waves do not?

The wavelength of radio waves is much larger than the size of the buildings, but the wavelength of light waves is much smaller.

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.