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

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

At the United Kingdom's only residential library you can sleep among the books.

A museum marks and documents the site of the Titanic's launch.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Every year locals give the bear a fresh coat of paint to preserve its signature goofy grin.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

This quiet bird sanctuary on the Danish coast is home to something not usually found in a conservation area: hunters' cabins.

This Danish art forest places loud works of contemporary art among the pensive silence of nature.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

Four alabaster giants contemplate the tides on the shore of Denmark.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A natural wonder in south Denmark.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Six beautiful wooden giants are hidden around Copenhagen.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.