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

Behemoth, cannon-like telescope operated by generations of Irish earls.

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

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

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

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Dramatic river bend surrounds a natural red-rocked pedestal.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

Groups of prehistoric tombs that dot the mountains of northern Oman.

Whitewashed mosque contains the world's largest carpet.

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

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

Home to the world's oldest functioning orrery.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Conifers from the Jurassic Period transformed into stone in Patagonia.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

This stunning mass of ice spans 121 square miles and is still growing.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Spanish religion mixed with local architecture has yielded a network of churches unlike any other.