Visit the Blyde River Canyon

Trails and tunnels along a marble canyon so narrow the cliffs nearly touch, with the Eternal Spring Shrine over a waterfall.

Gorge trails on ladders, chains and walkways over waterfalls.

Monasteries atop soaring rock pillars.

Rhyolite mountains streaked orange, green and pink, with a natural hot river to soak in after the walk — the start of the Laugavegur trail.

Climb 740 steps up the El Penol monolith for views over a maze of turquoise reservoir lakes.

Slot canyon on Navajo land near Page, Arizona, carved into swirling sandstone by flash floods.

See the steep dark cliffs and narrow river-carved gorge of Black Canyon of the Gunnison National Park.

Flat-topped mountain over Cape Town.