Tunnel Beach, located near Oceanside, Oregon, is a hidden gem accessible through a man-made tunnel carved into a massive basalt cliff. This secluded beach offers a 300-yard stretch of sand and cobble, perfect for agate hunting and exploring sea stacks. The tunnel, built in 1926, adds a touch of adventure to the experience as visitors emerge onto the rugged coastline beyond. With its stunning views and unique rockhounding opportunities, Tunnel Beach is a must-visit getaway on the Oregon Coast for nature lovers and beachcombers alike.