Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

An Irish peat mine has become a stunning sculpture park.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

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

A stunning Victorian abbey and walled garden on a lakefront.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

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

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

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

Just another ancient, mysterious Irish stone circle.

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

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

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 Irish museum in a historic 19th century market pays tribute to the glory of butter.

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