A surreal botanical garden with an even more surreal tour guide.

Read a book with a glass of wine at this classically restored bar.

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

One of Europe's largest supercomputers is housed inside of a disused chapel.

A once-secret library of Freemason history in Catalonia.

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 least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

This sublime architectural marvel is a rare example of an expressionist church.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

The library's graceful rotunda is like a bibliophile's temple.

A collection of trees from various corners of the world call Stockholm University home.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

The 19th-century home of Count and Countess von Hallwyl is now a museum.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Thousands of well-dressed mummies below a monastery.

In this medieval church, a centuries-old stuffed crocodile hangs from the ceiling.

This massive piece of aviation history calls this residential neighborhood home.

The Hveragerði fissure runs through this unassuming shopping center.

King of the Saxons on top, Roman goddess of wisdom on the bottom.

Rome is now home to a stunning food museum and library.