The glowing blue Nymphaeum of Emperor Tiberius.

Geothermal waterfalls in Tuscany.

This delightful little museum is dedicated to only one thing: pasta.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Go inside to really appreciate this 500-year-old technological masterpiece.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

Bacteria and algae give the salty water its bubblegum hue.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

A beautiful but toxic fountain of mercury.

A stately palace has been converted into the world's largest cannabis museum.

A detailed 1:32 scale model of Scandinavia's largest telescope.

1,300 chamber pots and their eccentric collector.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

This cemetery features modernist statues as strange as its name.

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