Mount Teide on the Spanish holiday island of Tenerife is 3,718 m (12,198 ft) high, making it the highest point in Spain and all it's territories. It's classed as an active volcano but - fortunately for the tourists - there hasn't been an eruption for more than 100 years.

It's relatively easy to get up the mountain as there is a cable car that takes visitors to a shoulder of the mountain, at 3,555 m (11,663 ft) - 163 m or 535 feet from the top. Before travelling on the cable car visitors with heart problems, etc are advised not to make the trip due to the height and rapid ascent.

When I visited (in April 1986) I continued climbing to the very top, which proved to a strenuous exercise. I would hesitate to try it again now. Coincidentally, whilst I was there the disaster of Chernobyl took place, contaminating much of Europe and beyond.

The photo was taken from near the top station of the cable car and part of the large caldera can be seen.