The Scenic Railway, the world's oldest continually-operating roller coaster, found at Luna Park in Melbourne, Australia. Built in 1912, this is a side-friction wooden roller coaster, meaning it lacks an extra set of wheels under the track to prevent cars from becoming airborne. Instead, a brakeman stands between the two cars (visible here wearing a purple vest and a backwards cap) and slows the ride down when necessary. It is one of only nine remaining side-friction coasters in the world.Photo credit: Stevage