A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

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

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

An out of this world experience.

This small, unassuming street is now a canvas for color and creativity.

A Hawaiian stairway to heaven—that you can't climb.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

Try your hand at old-fashioned coffee growing at this museum devoted to one of the world's most coveted beans.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This blowhole is supposedly caused by a trapped monster.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Race through the maze, get your name on the sign.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A tunnel of hardened lava along Maui’s famous Road to Hana.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

Dramatic river bend surrounds a natural red-rocked pedestal.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

Inside this garden, visitors are offered a glimpse into how inhabitants of the region survived centuries ago.