A tower devoted to — and modeled after — the Divine Comedy.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

An unusual round church in London with a Templar past.

Famously misunderstood wonder of the ancient world

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

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

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

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

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

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Hear the quietest sound from across the dome.