Once they are published in a book or on the internet, they are no longer either hidden or secret.
These are the things you discover along the way. On the road, follow an interesting sign, turn towards that unusual structure or enter a cool looking restaurant. These are the things you find cruising along the byways and backroads.
Often the locals will tell you. When shopping choose the checkout with the longest queue and engage with your fellow shoppers. No knowing what you may learn.
But you're not likely to find any flying at high speed along the super highways.
Lifey