A list of instructions explaining the controls appeared directly above the entrance of a tunnel I was supposed to squeeze through. Crawling deeper into the tunnel required that I use the dual ...

You can crawl through the gap of the train ... In the long train car tunnel between the two red rooms, look for a destroyed train car at the far end of the tunnel, and then search along the ...

Put toys at one end of the tunnel and the baby at the other end. Show the toys to the baby and encourage him to reach out to ...

They're called the Cu Chi Tunnels, and tourists travel from around the world to crawl inside. They love ducking below camouflage trap doors and cramming themselves in the tight passageways.