Ever wanted to know what's the view like being the highest person in all of Spain? -- No? Hmm, can't help you then. -- Otherwise:

That's on the summit of Pico del Teide at 3718m, on Tenerife island. Unless you leave solid ground this is as high as you can get in Spain. 163m lower it's a bit more obvious that the Teide is a volcano:

And coming down to the surrounding caldera it's even more obvious:

On a ridge next to the caldera you find the Teide Observatory:

The caldera is covered in old lava flows:

Vulcanism has created various interesting rock formations in the caldera:

Tenerife is not just about the Teide and its dusty caldera. In the north of the island you find the Anaga mountain range:

Neighboring Gran Canaria was where our little trip started and ended, right after the Gran Canaria Desktop Summit. Gran Canaria has no Teide but a very impressive landscape nonetheless:

That's the view from the Roque Nublo, the island's most famous landmark. The rock itself is visible here (on the left):