For more than two centuries, this family-run establishment has been serving up some of Ireland's best oysters.

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

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

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This expansive bridge in the Canadian wilderness was originally just built for friends.

An old World War II hangar holds 20 vintage aircraft and the rare opportunity to take a ride in a 1940s warbird.

A sprawling cave network created by a lone lava tube.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

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

An 1814 castle that hosts an exhibit of "explorabilia".

An unassuming historical marker for an iron age fort leads you to an oddly adorned cemetery for unbaptized children.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

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

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

Just another ancient, mysterious Irish stone circle.

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

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

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.