The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

A retired military stronghold on the rolling green coast of Donegal.

A museum marks and documents the site of the Titanic's launch.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

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

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A sulfuric martian landscape that looks far better than it smells.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Jesus' footprints and the first catacombs in the world.

Breathtaking and huge 430 year old maps of Italy.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A Nesting Doll of Churches.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The oldest operating pharmacy in the world features 800-year-old recipes.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This community on a small Venetian island has taken to painting their houses in bright neon hues.