One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The oldest residential street in Europe also features an optical illusion.

The final resting place of one of the most influential modern occultists.

This former quarry is now a vibrant labyrinth of magical in situ sculptures.

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

This tangled English forest looks like something right out of a fairytale.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

These unique markers designate the route American forces took during the Liberation of France.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

To the famous surrealist artist, liberty required two torches held high.

An ancient ossuary in Rouen.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

Two small chapels housed inside an ancient tree.

A former milk-delivery driver and his wife turn their home into a glimmering mosaic.

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Inspired by Thomas Stothard's painting of the "Journey to Canterbury," albeit with Canterbury natives.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

A wonderfully eccentric Victorian-era museum and library.

One of England's most famous churches hides a pair of little known architectural treasures.

This skewed English house has looked like it's going to fall over for centuries.