This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The world's tallest box hedge is found in a delightful garden.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

Huge standing stones mark a site of megalithic mystery.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

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

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

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

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

A retired military stronghold on the rolling green coast of Donegal.

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

A pretty park of over 1,600 olive trees that grew from just three saplings brought over from Spain.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Huge stone depressions which may have acted as an Incan agricultural experiment.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.