This church sits upon a peaceful hill and a long, turbulent history.

This former limestone quarry is now a subterranean wonderland of grand stonework.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

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

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The modern birthplace of Irish freedom.

The library's graceful rotunda is like a bibliophile's temple.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

A 18th century graveyard and its astonishing cortege of macabre iconography.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

France's most famous cemetery, with some of its most curious tombs.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.