A gated cross stands on the site where an Irish revolutionary met his end.

The ancient tomb acts as a calendar that keeps perfect time.

A massive Celtic cross secretly growing in an Irish forest.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

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

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

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

A stunning Victorian abbey and walled garden on a lakefront.

Modern sundial uses ancient methods to tell time and date perfectly.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

The world's tallest box hedge is found in a delightful garden.

It's said this geological anomaly was caused when the Devil took a bite out of the Irish mountainside.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

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

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

This 14th century tower house was once the home of Irish poet W.B. Yeats.

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

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.