Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

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

A modern English garden of eccentric beasts, follies, and oddities.

The undercroft is a spectacular example of medieval Cistercian architecture.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This Victorian gate contains cryptic inscriptions in Greek, Latin, and Hebrew.

This oddly placed 15th-century church is one of only six bridge chapels left in England.

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

These medieval monastery ruins are surprisingly overlooked by most tourists.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

One of the U.K's earliest public water supplies is within the "plague village."

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

19th century tunnels burrowed under Liverpool.

A thousand year old oak tree survives in Liverpool.

Six neolithic sandstone boulders remaining from a dolmen.

The heroic tale of a remarkable pup who refused to leave her master's side, no matter what.

One of the largest mechanical models of the solar system in the world.

Giant statue of a disembodied head.

This Georgian architectural masterpiece is the only cloth hall left in Britain.