The Maltese Islands actually consist of multiple islands – Gozo being one of them. From Valletta, it takes quite some time to get there by public transport – the bus ride to the harbour of Ċirkewwa takes one and a half hours, the ferry then goes to Gozo every 45 minutes with another bus waiting at the Gozo harbour to take you further to the desired destination. Prepare for full busses and windy roads. So unfortunately, there is only so much that can be seen on a day trip. The Ġgantija megalithic temples are part of the Unesco World Heritage sites and the Cittadella of Victoria is also worth a visit. It is also possible to do boat rides to the Blue Lagoon or to visit the Azur Window (the GOT filming site that crashed into the sea).
The megalithic temples of Malta are some of the oldest free-standing structures on earth that survived till today and part of the Unesco World Heritage sites. Most of the artefacts found at the temples were removed to be displayed in museums.