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

These murals stand as reminders to the troubled history of this Northern Ireland city.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A diminutive, thousand-year-old church believed to be the smallest in Ireland.

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

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

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

The remains of a concrete ship sit on a sandbank between Ballina Quay and Belleek Woods.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

The ruins of a monastery that dates to the 7th century.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

An extraordinary mixture of natural beauty and man-made phenomena.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

An effigy of Vancouver's Gastown neighorhood's namesake.

This enormous photomural pays homage to Vancouver's infamous history of public activism.

First flying reptile discovered in British Columbia was for years forgotten in a cabinet.

From mining complex to industrial exhibition, this museum once played a major part in the X-Files.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

This nature mural exists to protect the surrounding environment and its own canvas from destruction.

The “Grand Canyon of Maine” is a three-mile gorge full of striking geological features.