What is the difference between 参观 and 游览
The main distinction is that 游览 implies a sense of "to leisurely journey":


the traditional meaning of 游览 is "to go sightseeing" by leisurely moving around while looking at scenery, famous sites, etc; e.g. 我昨天去游览西湖, "I went sightseeing around the West Lake yesterday."
a second meaning of 游览 is to specifically go on a trip to visit a place; e.g. 我要參團去游览故宮, "I am going to join a tour group to visit Palace Museum."
参观 on the other hand means to look at things at a specific place; e.g. 我想去參觀故宮, "I want to tour the Palace Museum."


The second meaning of 游览 may seem like it overlaps with 参观 somewhat. It does, but there's an important distinction in that 游览 implies a sense of journeying (i.e. as a part of a tour group), whereas 参观 doesn't imply that at all.

If you're going to a housewarming party, you wouldn't talk about going to 游览 their neighbour's new house. It is perfectly fine to talk about 参观 the house, however. In contrast, a tour group might advertise itself as "taking you to 游览 Hobbiton in New Zealand". Then once you've arrived, the tour guide might say "next we will 参观 Hobbiton".

If in doubt, use 参观.