See gorgeous frescoes at this modest Byzantine place of worship.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

The mirrored section takes the shape of Hebrew characters when viewed from above.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A set of seven houses, each built in a style that represents a European country.

Amsterdam's former hotspot for public executions and dissections.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

One man's remarkable private collection of art from around the world.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.