From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

The highest peak in mainland Spain is said to be the final resting place of a Muslim king.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This 47-story "M" needed 20 years to be completed

Giant topiary dog once played a role in a terrorist bomb plot.

Spain's stunning solar energy plant.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Bacteria and algae give the salty water its bubblegum hue.

The oldest Roman lighthouse still in use.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

"Alleys of Stone" form natural mazes in Spanish natural park.

The world's largest wooden structure.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

Rare karst landscape eroded from a flat seabed.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

An ancient Egyptian temple in the middle of Madrid, Spain.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.