Roman ruins top white travertine terraces formed by ancient hot springs.

The beams of the New College, Oxford dining hall come with an amazing story.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This 11th century tower is said to be the oldest building in Oxford.

Once one of the largest rooms full of books in the world, this bookstore basement is still a treat for bibliophiles.

Banksy gives themself artistic license with this piece of London street art.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The oldest continuously operating mint in the world that has been making coins since the 9th-century.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

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

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The history of radiation is on safe display at the foot of a radiation science laboratory.

France's national museum of scientific and industrial instruments.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A beautiful and classically designed villa, with an hourly infestation of monsters.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

Historic medieval fortified city in southwest France.

This abandoned airplane hanger is said to have once been a top secret launch facility.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.