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

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

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

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

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

An enormous and lavish Gothic church in Czechia.

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

Hundreds of Buddhas in a re-discovered Indonesian temple.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An unusual round church in London with a Templar past.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

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