The whimsical steel spider lurking in the shadows of this suspension bridge shows that engineers can have a sense of humor.

The UK's largest private house was the subject of a long-lasting political dispute.

The collapse of the brand-new dam caused one of the worst floods in British history.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

A century-old tradition has culminated in a small but singular collection of feline effigies.

The little-known second castle that William the Conqueror built in York.

Cycle the solar system—from the sun to Pluto—right here on earth.

Collapsed television tower finds new life as a control tower for boat races.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

The only surviving leech house in the United Kingdom was a home for bloodsucking worms until the 1900s.

The largest preserved walking dragline excavator in Western Europe.

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

Reputedly based on the tomb of Jesus Christ, this crypt is the oldest surviving structure of any cathedral in England.

A stone obelisk towering over the surrounding countrysides beckons hikers across the rolling moors.

This tallest folly in the world began its life as an elaborate factory chimney.

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

Probably the smallest museum in the world, housed in a disused phone booth.

A copy of the brutal decapitation device that predated the French Guillotine by about 200 years.