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

Famously misunderstood wonder of the ancient world

This Stockholm light tower can be controlled by anyone with a smartphone.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

Tens of thousands of tiny bottles stuffed with various items.

A subterranean house of worship carved right out of the bedrock.

An abstract monument to a symphonic composer.

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

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Old Danish castle immortalized in Shakespeare's Hamlet.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

A black cat protests the City Guild in Riga's Old Town.

Norway's chilly all ice-instrument festival.

A little sculpture with a large wardrobe.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This elegant arc of a waterfall marks a religious turning point.

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

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A church of bones, decorated with 40,000 human skeletons.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.