An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

A pair of connected skyscrapers form this symbolic gateway.

A tiny rural community in Switzerland was home to one of history's most shocking murders, and led to the banning of Absinthe for nearly a century.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

Visitors may notice something strange walking through this quaint German town.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Luminaries of all stripes have sipped strong Greek coffee at this cafe since 1839.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

A sharp sculpture made of thousands of pieces of jagged glass.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This 1920s Dutch barge is now a floating bookstore.

A remarkable medieval structure born from a 14th-century disaster.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

A complicated contraption for telling time by the moon.

An unusual artwork dedicated to a unique man that entertained people visiting Cambridge while raising money for charity.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

A treasure trove of scientific instruments from the 17th and 18th centuries.