This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

The atmospheric road was never meant to be so creepy.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

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

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

A sacred well steeped in Pagan roots on the West Coast of Ireland.

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 bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

A more chill but no less fascinating version of the famous ancient archeological site.

Caves that can't seem to quit producing the remains of prehistoric humans.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.

A beautiful 62-acre Catholic shrine and botanical garden.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

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

Quite simply the largest tree in the world (by volume).

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Ruins of a 10th century church tucked away deep in a botanical garden.