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

This massive monument has been telling the time for 150 years—at a slight angle.

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

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

These engineering masterpieces are a dominant feature of the Belfast skyline.

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

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

Double spiral staircases are not unheard of, but they are very rare.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Several bricks indicate the various flood levels this crossing has survived over the centuries.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A multi-storied painting that depicts the area's rich and diverse maritime history.

People leave coins atop an unusual grave marker in one of Scotland's oldest burial grounds.

This monument depicts a harrowing event involving an escaped polar bear.

A bronze tribute to the wildly popular video game from the '90s.

This Georgian architectural masterpiece is the only cloth hall left in Britain.

Helped by a surprise posthumous donation this small town toy museum features over 5,000 vintage playthings.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

These unique stepping stones hug a river's edge to take hikers on a journey through a limestone gorge.

A historic Georgian building and warm springs.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.