You Do Need power plug adapter while traveling from Vatican City to Cuba.

Here is Why You Need An Adapter

The outlet and plug type used in Cuba are A, B, C and L and in Vatican City are C, F and L. This is how they look like.

Vatican City

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L

Cuba

In Cuba, outlets of type A, B, C and L are in use.

Type A

Type B

Type C

Type L