This is the former location of a puzzle cache that was archived. It's a nice spot where a lot of folks from out of town can log a quick find while they enjoy being tourists.
The cache is not visible so you will have to use your geo-senses and actually hunt for it.
Beware: This spot will be saturated with muggles for brief periods each day.
Also, please be respectful of the area and and pick up trash whenever possible.