Morocco
A river vanishes beneath a fifty-metre limestone arch furred with pale travertine.
From the road, the ground appears to fold in on itself. Stone steps descend until the daylight is framed by a vast limestone arch, with birds crossing the opening and the Tissilt River working through boulders below.
Walk the upper viewpoints first, then take the stepped circuit beneath the bridge when the rock is dry and the river is settled. The arch rises about 50 metres above the gorge floor, cut through Lower Jurassic limestone and faced with younger travertine deposited by calcium-rich spring water. Peregrine falcons, white-bellied swifts and kestrels are among 92 recorded bird species, so pauses under the vault reward more than a quick photograph. Extend the outing towards Iouaridene's dinosaur tracks, Boughrart's potters or Demnate's old fabric for a full geosite day. Heavy mountain rain can turn the channel dangerous and winter snow can interrupt the road, so skip the lower circuit after rain, wear gripping shoes, keep back from loose edges and leave every fossil, nest and mineral formation in place.
Friends
Wear shoes with grip and keep everyone within sight on the loose stepped circuit. Hire a licensed guide for longer trails or dinosaur sites, carry water and keep hands away from fossils and bird nests.
Couple
Take the upper viewpoint first, then decide together whether the stepped circuit belongs in the day. Demnate's pottery and food traditions make a strong second half without entering working spaces uninvited.
Rabbit tagine with Demnate raisins, the town's named regional variation.
Homemade fruit jam from the Tiwizzi women's association in nearby Aït Oumghar.

Arenal & La Fortuna
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Drakensberg
South Africa
Basalt walls rise above sandstone caves painted across thousands of years.

Sani Pass
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A switchback road climbs from green foothills to a high border above the clouds.

Rincón de la Vieja
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Volcanic mud pots belch and bubble through dry tropical forest like the earth digesting itself.

Tan-Tan
Morocco
Tbourida thunders past white tents as Hassaniya poetry gathers more than thirty desert tribes.

Tata Palm Groves
Morocco
Elephants and rhinoceroses survive in stone beyond Tata's living palm shade.

Ziz Gorge
Morocco
An old tunnel opens onto a limestone gorge where the river holds villages to the rock.

Chefchaouen
Morocco
A whole mountainside rinsed in blue, and the town still argues over who started it.