Submarine
This is an inside look into an actual submarine, where people roam around safely under the sea. How anyone could live a life in a metal tube under the sea baffles the mind, but these professionals do it! The person walking below the machine provides some insight into how big this thing actually is...
Golden Gate Bridge
Inside the Golden Gate bridge is not a sight anyone expected to see in their lifetime, but here it is in all its glory. The main span of it is 4200 feet, which is pretty long if you think about it. One cable is about 7650 feet long, but there are some more exciting measurements on that little place card.