Experience what life was like in Ireland during the Viking and medieval ages.

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This riverside restaurant has been serving customers since 1146.

The silly symbol for an underground protest group is now scattered around the city.

A spectacular cave and a beguiling lake.

The hallucinogenic center of the ancient world.

See how paper is made the old-fashioned way.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A museum wholly devoted to juvenescence.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A cluttered and astounding collection of antiquities and curiosities.

An unusual round church in London with a Templar past.

Eighty million natural history specimens call this gargantuan museum home.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

Monasteries on rock pillars, once accessible only by frayed ropes.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

A dead saint, a deadly poison, and a mysterious holy ooze.