Four types of volcanoes—shield, composite, cinder cone, and plug dome—can be found in Lassen Volcanic National Park, where they literally bubble and steam.

What’s unusual is that hikers are able to see the exposed volcanic plug with its columns ... Great for walking, hiking, or biking, the Calavera Nature Preserve includes a 1.9 mile loop around ...

Rising tall from the sea and covered in emerald-colored vegetation, these volcanic plugs (or land formations ... locals caution against hiking Petit Piton unless you are a pro climber, as the ...