New York Mysteries
Today in Central Park I came across a small pavilion, a little roofed gazebo sort of structure that would seat about 4 people positioned on a lake. You can see it here, it is in the little known Wagner Cove area of the park. On one of the supports for the roof was a small plaque that read: "This structure was strategically placed to prevent George McGuggan from backing his horse into this sacred body of water." There is no date, and no further explanation, and I can't for the life of me find any other reference to Mr. McGuggan, or his horse, or why the city didn't want him backing it into the lake. Another of the city's mysteries.
It seems that the Central Park folks tweaked their site, and that link to the gazebo photo now dangles.
This page:
http://www.centralparknyc.org/visit/things-to-see/south-end/wagner-cove.html says Wagner Cove and shows a gazebo. Maybe that's it?