Pedal-powered roller coaster, Sky Cycle, is located in amusement park “Washuzan Highland” in Okayama Prefecture, Japan.
Old roller coaster, 16m under the ground, with no guard rails, no security, is only for visitors who have nerves made of steel.
One of them said:“The more you fear, the faster you pedal”. Well, I believe it’s true!
Pictures of pedal-powered roller coaster from the link