This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

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.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

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

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

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This small museum tucked within a subway station holds pieces from Madrid's past.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

Inside this cathedral is a shoulder bone belonging to the Patron Saint of Scotland.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

A book bound in the skin of an infamous criminal, along with countless other specimens.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Protecting the dead from opportunistic body snatchers.

A 18th century graveyard and its astonishing cortege of macabre iconography.