The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

An important landmark in the history of algebraic logic.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

The oldest public library in Ireland.

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

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

Experience what life was like in Ireland during the Viking and medieval ages.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

This striking sculpture of Icarus honors Greece's fallen flyers.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.