A cynical face-off exposing the cost of war.

An important landmark in the history of algebraic logic.

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

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

Northern Ireland's Brobdingnagian stepping stones.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The house where the writer spent his formative years.

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

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

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

Giant, friendly pelicans in Central London, the most unlikely of places.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.