One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

This 16th-century house tells the city's history through old artifacts and quirky tales.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A scattered trail of street art adds a pop of color to the city's stark structures.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Largest lake in Great Britain measured by surface area.

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

This Scottish bridge seems to compel dogs to leap to their death.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The heads of two giant mythological water horses honor Scotland's horselord past.

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

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A statue of the second-tallest Dutchman in history.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The history and future of cannabis.

Museum preserving torture methods from the past.