A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

This single room has survived the centuries with almost no deterioration.

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

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

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

A corkscrew-shaped barn in Ireland.

A moody and picturesque riverside ruin overgrown with vegetation.

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

A remarkably intact castle that once was the largest in Ireland.

Obelisks and stone pineapples in the Irish countryside.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A hands-off space for graffiti artists to hone and display their skills.