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

This police call box harkens back to an era of pre-radio communications, and has a rather unique feature.

The whimsical steel spider lurking in the shadows of this suspension bridge shows that engineers can have a sense of humor.

Once a training ground for Olympic athletes, this artificial ski slope has fallen into ruin after a fire in 2012.

This commercial and retail center was crafted from walled military barracks.

In the 19th century, this pit housed a fully grown black bear for the entertainment of visitors. Today there is a sculpture in tribute to the poor creature.

Cemetery established by the Victorians as a solution to the overflowing graveyards.

This Sheffield sculpture composed of 17,000 Allen keys honors both urban falcons and a furniture icon.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The last resting place of the famous Native American princess is marked by a haunting monument.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

Europe's "only museum dedicated to the decapod" is full of quirky and absurdist displays, including one featuring the "famous" Giant Crab of Margate.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.