Christ's blood preserved in a Belgian town.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This enormous censer uses a pulley system installed over 400 years ago.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

Follow the original medieval paths that wind through this intriguing section of the city.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The anatomical-pathological collection of a man who changed surgery.

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.

This World War II relic let Allied pilots know they were entering neutral airspace.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

An oddly conical beacon perched atop beautiful Irish cliffs.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This Neolithic passage tomb forms part of a World Heritage Site.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

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."