This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

Walk in the footsteps of the gods and straddle two tectonic plates.

The oldest cemetery in Belgium.

The burial site of a murdered bishop and his alleged killers.

The first crematorium in the Netherlands.

An intricate network of underground tombs carved into volcanic rock.

Christ's blood preserved in a Belgian town.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

These skilfully executed, poignant works of art dot a verdant Scottish dell.

One of the most spectacular 18th-century bridges in Scotland.

Britain's only herd of free-ranging reindeer.

Designed to allow funerals to proceed over the River Dulnain.

A once-magnificent collegiate church is falling into ruin.

Lavish royal estate punctuated with heated greenhouses.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

Hop aboard a charming bog train to explore this rare open-air museum of peat.