Quirky Welsh observatory unites art and science.

Picturesque ruins once held off mighty armies.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

The stately remains of Llywelyn the Great's mighty fortress.

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

Research station devoted to mysterious floating lights seen in a Norwegian valley.

Norway's national monument to fallen seamen.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

What might look like a cliffside sacrificial altar at first glance is actually a stone compass pointing to cities and lighthouses all around the world.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

The world's northernmost aquarium looks like it has fallen over.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

Cold storage for agricultural biodiversity.