A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

Long tunnels run under the ancient chariot racing circuit to the tower.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

Stunning Roman aqueduct used for 1900 years and still standing.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

The modern birthplace of Irish freedom.

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."

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

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

An ancient neolithic tomb that only sees the sun twice a year.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

One of Ireland's most infamous prisons for rebels including men, women and children.

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

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The United States Capitol's former columns still stand.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.