He could have an adventure in the Spanish wizarding markets. There would be all sorts of strange and wonderful magical items for sale. He might find a unique wand or a potion ingredient that's not available in England.
In fanfiction, Harry Potter going to France could lead to an adventure where he gets involved in a mystery related to a powerful French magical artifact. He'd have to team up with local wizards to solve it and in the process learn about the rich history of French magic.
He could go on a road trip across America. Imagine Naruto seeing the Grand Canyon or the Statue of Liberty for the first time. It would be an amazing sight for him.
In fanfiction, if Harry Potter goes to Spain, he may discover new magical artifacts. Spain has a rich history, and there could be artifacts related to the Moors or other historical periods that hold great magical power. He might also have to adapt to the Spanish wizarding culture, which could include different festivals, traditions, and social norms within the wizarding community.
There's a chance he'll meet other outcast wizards. These wizards might have been shunned by the wizarding world above ground. They could be very different from the wizards Harry is familiar with, perhaps having their own unique styles of magic. They might initially be hostile to Harry, seeing him as an outsider from the 'normal' wizarding world, but later they could become his allies. They might also know secrets about the underground world that could help Harry in his future battles or quests.
Harry could get involved in a quest to protect a Spanish magical artifact from dark wizards. Since Spain has a rich history, there could be many such artifacts that are important to the Spanish wizarding community. He might have to travel across different regions of Spain, from the sunny beaches to the mountainous areas, facing various challenges along the way. He'd also encounter different types of Spanish witches and wizards, some friendly and some not so much, all while trying to keep the artifact safe.
In France, Harry could end up at Beauxbatons Academy. There, he might participate in their unique magical competitions. He could also learn about different forms of divination or potions that are specific to the French curriculum. He might face some challenges with the language barrier at first, but as he delves deeper into the French wizarding community, he starts to pick up the magical French terms and use them to his advantage. He could also form a bond with a French witch or wizard who helps him navigate this new world.
In certain fanfiction stories, when Harry goes to Gringotts, he could be on a quest to retrieve a powerful magical artifact. Along the way, he may meet new characters, either friendly or hostile. He might have to fight his way through various security measures, which could include things like enchanted doors and traps. And his visit to Gringotts could be a turning point in the story, setting off a chain of events that will change his life and the wizarding world around him.
He could have a potions - making adventure. Snape might teach Harry some advanced potions techniques that are not taught at Hogwarts. Or Harry could discover some of Snape's old potions experiments.
Maybe he'll be looking for a magical destination. He could be seeking a place to find new magical creatures or study ancient magic. The travel agent might offer him a trip to a hidden wizarding village in the Alps, full of unique spells and potions.
Well, often in these fanfictions, Harry goes to Knockturn Alley out of curiosity or in search of something specific. There, he may run into characters who have ties to the Dark Arts. For example, he could meet a wizard who is an expert in dark potions and has to use his wits to get out of a tricky situation without getting involved in any illegal or dangerous activities.