Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

A vortex fountain that seems to rise out of the ground.

This tiny traditional smokehouse is the only one left in this historic fishing port.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

What looks like missing grout is actually an old pub's peephole.

This hidden natural fountain issues forth a steady supply of supposedly healing water that tastes like rotten eggs.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A perfectly running 230-year-old silver automaton and music box.

These medieval carvings bear scars left by Parliamentarian troops during the English Civil War.

When the public was consulted about a new piece of street art, they naturally asked for an enormous metal dragon.

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.