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

A science fiction-inspired apartment building designed by a famous Spanish architect.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

The morbid items in this small and hidden museum are not for the weak stomached.

The final resting place of the great navigator, or maybe his brother.

Cliffside houses provide a spectacular view from their perch above the valley.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

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

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A beautiful but toxic fountain of mercury.