The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The ancient tomb acts as a calendar that keeps perfect time.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The untimely death of a dignitary's daughter led to this fort being abandoned before it was ever finished.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

These lesser-known Maltese catacombs date back over 1,700 years.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

A hidden tunnel of bones in one of Malta's oldest churches.

This subterranean necropolis holds three floors of antler-dug grave caves.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

The site of Austria's biggest concentration camp now honors its victims.

German and American troops joined forces to defend this fortress during the strangest battle of World War II.

The shell of a medieval fortress offers commanding views of the area it once protected.

The personal charnel house of Anton Bruckner.

The solemn exterior conceals an opulent interior of this 17th century church.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

An exquisite Baroque church in Vienna's old town.