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

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

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

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

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

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

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

An ancient Viking village in North America that predates Columbus by 500 years.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

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

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A church of bones, decorated with 40,000 human skeletons.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.