A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The longest and tallest aqueduct in Britain can actually be sailed across.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

A shipwreck named Desire at the shore of Batumi.

This medieval fortress is (or was till 2017) the home stadium of the football club FC Duruji Kvareli.

A beautiful but deteriorating monument of Soviet architecture.

A gleaming white and undulating tower marks the border between Georgia and Turkey.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

A massive Celtic cross secretly growing in an Irish forest.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

Modern sundial uses ancient methods to tell time and date perfectly.

A collection of housewares from recent Irish history adjoined by a tower from ancient Irish history.

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

An 1814 castle that hosts an exhibit of "explorabilia".

The home of Ireland's last leprechauns is officially protected by the European Union.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Oriental bazaar in the heart of Sarajevo.

An abandoned faux-pub made famous by a Guinness commercial.

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.

This museum is dedicated to the most famous Irish writers in history.

Designed to commemorate the king's coronation.

The modern birthplace of Irish freedom.