If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

Designed to illustrate two parts of the human psyche.

The first woman in America to receive a medical degree.

Built in the 16th century, the tower is now in ruins.

One of only three examples of a stained glass window manufactured by the Tiffany Company in Scotland.

On the outskirts of Edinburgh, a trio of topiary created by one man over the course of more than 20 years.

In the 18th century, the Earl of Buchan mapped the universe on this stone pillar.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

This small memorial honors a ferocious feline and local hero.

The unconventional Scottish soccer coach required players to wear a collar, tie, and bowler hat for matches.

This bronze cat looks out over the Linlithgow Canal.

This unassuming stone is possibly the oldest Scottish memorial to the 13th-century knight.

This museum offers a glimpse into early 20th-century Glasgow life.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

A burial vault located under Tiber Island in the middle of the Italian capital.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

One of the most important yet well-hidden museums dedicated to the history of medicine.

A fairy tale castle in modern Rome.

Architectural monsters are devouring this palace's every door and window.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Notorious artist squat renovated into legal studios.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.