Antelope Slot Spins

Down into a slot canyon in Arizona: through twisting walls of wavy orange sandstone, past shafts of light falling from the rim far above, round a corkscrew out over the slot and back in, to the sandy wash at its mouth.

• Series: Canyons
• Length: 1.4 km
• 20 marbles a race, about a minute; every race is free