Rock On.

"What can we steal?"

Gibraltar, UK – Like a rigid lightning bolt, the Charles V Wall zigzags precipitously downward.

Its 660 narrow and steep stone steps are patrolled by Barbary macaques, which scamper up the wall and rest unhelpfully at our feet. While they're no doubt accustomed to humans, I still don't find it wise to step over a mother nuzzling her baby.

With so little room to turn around, I'm at least afforded time to catch my breath. 

All morning, the Rock of Gibraltar has been shrouded in cloud, shrugging in darkness. Having begun our trek at 7 a.m., we arrived at the Devil’s Gap Battery an hour too early to enter the nature reserve. Naturally, the attendant was late.

And had forgotten his keys.

A Christian rock show.

But we've had the trails mostly to ourselves, apart from the occasional minibus and plenty of monkeys. Most sit quietly, picking at family members' fur. Others jump into treetops, causing branches to draw wide-arcing parabolas. Still more slide across the glass Skywalk – which was, humorously, dedicated by Mark Hamill – rendered slippery from fog.

They're thoroughly delighted. As are we.

We stop at St. Michael’s Cave, where a light show illuminates stalactites and tells some of the history of how it was formed. Ancient Greeks believed it was the entrance to Hades.

Now a concert venue and tourist attraction, we dodge slow drips. A swirl of purple and pink illuminates a formation that takes the shape of an angel.

Stepping outside, the heavens open more fully.

What a fantastic day.