The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This artificial cave looks like something out of a fairytale.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Medieval village and microminiature museum.

Kissing the ass of this stone lioness has become a rite of passage in the city of Girona.

Designed by Gustave Eiffel before his famed tower.

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.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

An architectural oddity hides in plain sight on this iconic London bridge.

Ship-sized kinetic sculptural fantasy.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

There's an exclusive Beefeaters pub hidden in the Tower of London.