The world's only museum devoted to the wonders of fluorescence.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

The dramatic remains of an abandoned farmhouse sit high on the edge of a remote hillside.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

A mysterious ruin shrouded in more folklore than fact.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

The community pools that the community refused to give up on.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

A historic hill of tall tales, with one rather special tree.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

This home on a quiet suburban street is completely covered with vibrant mosaics.

A network of concealed passageways lies within a busy London Underground station.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

Remnants of a Victorian garden feature sitting in public woodland.

Hear the quietest sound from across the dome.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A student driver's nightmare.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.