The world's largest boar is a huge steel titan found at a French rest stop.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This disputed mass of ice is home to the highest battleground on Earth.

Haunted tuberculosis hospital built by the patients.

A monument at Alicante Marina honors a little-known hero of the Spanish Civil War.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

An ancient Egyptian temple sits within a modern European museum.

One of the great math minds of the 17th century is underfoot in this 900 year old Dutch church.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

This public library and its impressive collection of academic books have not changed since the 17th century.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The remains of a medieval wall discovered in the basement of a jewelry store.

Science meets wall art to highlight the beauty of famous mathematical equations.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The largest flower auction house in the world.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A beautifully eclectic mix of architectural styles.

Amsterdam's former hotspot for public executions and dissections.

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.

The history and future of cannabis.

Amsterdam's Red Light District leaves little to the imagination.