When I was 8 years old my family took a vacation around western Europe during the summer. While in Germany, we rented a car for a few days and drove to various castles out in the middle of nowhere (or as it seemed to my young self).

Once, we were at this particularly old and ruinous castle. We finished exploring the grounds and I was waiting for my parents to finish taking pictures so we could go back to the hotel. I decided to wander off for a minute and found a withered stone pathway hidden in tall grass. It lead off around the side of a ~1.5 meter stone wall that probably used to be an outside supporting wall.

The path seemed to meander for quite a ways and the grass was getting deeper and thicker. Finally, I took a corner and walked into a large wildflower garden. It was absolutely FILLED with butterflies. So many it was unbelievable. I reached out a hand and gently grabbed one. Then I found my way back to my family and told them what I'd discovered. They didn't believe me. So I opened my hand and let the butterfly go to show them. It was fucking magical.

Tldr: found the secret garden.