This natural sea arch highlights Ireland's rugged coastal beauty.

Local legend says the remains of Father Christmas lie within the medieval grounds.

The ruins of a medieval monastery named after a type of tree.

An oddly conical beacon perched atop beautiful Irish cliffs.

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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

The modern birthplace of Irish freedom.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

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

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

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

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

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

This preserved puppy was an adorable beacon of charity.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

At just 51 feet and 10 inches long, it's the shortest street in England.