Learn Romanian: Ce vizitați voi acolo? - What are you visiting there?

The verb is a vizita (to visit). It is a regular Conjugation 1 verb (verbs ending in -a). To make the "you" (plural or formal) form, you drop the -a and add the ending -ați, giving us vizitați.

Since the verb ending already tells us it means "you plural", do we need to include voi?

No, it isn't strictly required. In Romanian, the verb ending already shows who is doing the action, so subject pronouns are usually dropped. Including voi here adds a bit of emphasis, like asking "What are you guys visiting?"

Why does the English translation say "are visiting" instead of just "visit"?

Romanian doesn't have a separate "present continuous" tense (like the English "am/is/are doing"). The simple present tense form vizitați translates to either "you visit" (as a habit) or "you are visiting" (right now), depending entirely on the context.

Why is voi placed after the verb instead of before it?

In Romanian questions, especially those starting with a question word like Ce (What), it is very common to swap the subject and the verb. So instead of Ce voi vizitați?, it sounds much more natural to say Ce vizitați voi? (literally "What visit you guys?").