Here's an article describing a day spent searching for abandoned WW2 bunkers along Washington's Olympic Peninsula. The couple used Honda XT225 dual sport bikes to navigate the slippery trails.
http://westx1000.kinja.com/finding-abandoned-wwii-bunkers-on-washingtons-olympic-p-1707403098
The comments include pointers to several locations in USA and Canada where similar coastal military installations are located. Here in San Francisco, the WW2 bunkers (and Cold War-era missile defense launch sites) are well-known tourist attractions on both sides of the Golden Gate.
http://westx1000.kinja.com/finding-abandoned-wwii-bunkers-on-washingtons-olympic-p-1707403098
The comments include pointers to several locations in USA and Canada where similar coastal military installations are located. Here in San Francisco, the WW2 bunkers (and Cold War-era missile defense launch sites) are well-known tourist attractions on both sides of the Golden Gate.