Northern Ireland's Brobdingnagian stepping stones.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Eighty million natural history specimens call this gargantuan museum home.

Hidden beneath the streets of London is a secret subway that only carried mail.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

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

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

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

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

A particularly disconcerting tribute to Irish martyrs.

The modern birthplace of Irish freedom.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

The home of Ireland's last leprechauns is officially protected by the European Union.

A hugely vast Irish landscape of barren rock that stretches for miles.

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