A diminutive, thousand-year-old church believed to be the smallest in Ireland.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Belfast's namesake river still winds below the city center, hidden from sight.

These barriers stand as stark reminders of Northern Ireland's troubled past.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

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.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The most loyal of little dogs, or a Victorian era publicity stunt?

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

Go deep down into the earth to experience the world of Welsh coal miners.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

One of the few surviving street funiculars in the world.