A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

A haven for book enthusiasts across the street from Retiro Park.

The unfinished final resting place of some of Spain's most prominent politicians.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

The earliest known map to show America, discovered by accident at a Paris bookshop.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

One of the best examples of the modernist movement in Madrid.

The oldest vestiges of Madrid found here, have been incorporated into this new museum.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A rather vulgar example of the transition from Latin to the Italian vernacular.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

This beautiful spit of land was once the summer playground of the king of Spain.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

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

Five million people are laid to rest here, more than the population of Madrid itself.