The key website for finding labyrinths is the World-Wide Labyrinth Locator
"The World-Wide Labyrinth Locator has been designed to be an easy-to-use database of labyrinths around the world. Information about labyrinths you can visit, including their locations, pictures, and contact details, are accessible here, along with information about the many types of labyrinths found worldwide. Labyrinths occur in many forms, shapes, and sizes, and the Locator contains both historic and modern examples. At the current time the Worldwide Labyrinth Locator database contains over 3850 labyrinths in 70 or more countries."
~ World-Wide Labyrinth Locator
A growing source of labyrinth and maze locations is the collection of waypoints or waymarks in Google Earth and Google Maps.
There are many other sites dedicated to particular countries or styles of mazes. The links below are courtesy of Jeff and Kimberley Saward of Labyrinthos
There are sites dedicated to labyrinths in Australia and South Africa
Labyrinth Enterprises, LLC, is a collaborative of skilled labyrinth artists that was started byRobert Ferré. Labyrinth Enterprises has a site with hundreds of links worldwide.
Adrian Fisher designs mazes worldwide and these sites have links to some unusual contemporary mazes, including mirror mazes and laser mazes.