Oh, the time suck that is Flickr. I love the idea of a hidden passage way, and searching through Flickr brought up thousands of beautiful photos. Let’s just say Flickr does not help my tendency to procrastinate. 

Clockwise from left to right, these photos are from the following Flickr users:Marite2007, Col*, Squeaky Marmot, -Kronix, Zvillongco, Iman Khalili