Climb inside an iron crystal magnified 165 billion times its normal size.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Christ's blood allegedly preserved in a Belgian town.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

Stockholm's tiniest statue is of a small boy looking at the Moon.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

It houses the remains of a 17th-century version of the Titanic.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This emotive sculpture was originally created for the 1878 World's Fair.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The narrowest street in Paris.

Abandoned railway line circling the city of Paris.

This bridge was constructed from the rubble of the infamous Bastille.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The curious underground history of keeping Paris clean.