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

Here is Why You Need An Adapter

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

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

Vatican City

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

Type C

Type F

Type L