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

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The atmospheric road was never meant to be so creepy.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

The lake that fills and empties itself at random.

A modest stone circle in North Wales.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

This stately estate house features a tower covered in a bright, modern mural.

A site of pagan worship which still attracts people looking for fairies.

The only fixed chain and post trail in Scotland snakes its way along the base of a towering seaside cliff.

Hidden in a Scotland museum is a copse of extinct tree stumps.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

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

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

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

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

360° views of the city plus five floors of optical illusions and hands-on science.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This historic abandoned train station looks like a stop for ghost trains.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

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

A subterranean playground in an abandoned slate mine.

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