An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

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

This crumbling folly looks like an enchanted left over from Middle Earth.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

This London plaque marks the spot where David Bowie's famous alien made his debut.

A little slice of Japan and its aesthetics in London's Holland Park.

An artistic tribute to the famous singer, just around the corner from where he was born.

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

London's old-school healing garden.

This 1920s Dutch barge is now a floating bookstore.

A unique waterfall that some believe attracts the fairfolk.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

London's smallest police station is barely the size of a phone booth.

A fantastic castle rumored to be the birthplace of King Arthur.

The longest hedge maze in the world.

A remarkable medieval structure born from a 14th-century disaster.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

This operational mill has survived centuries of destruction and construction.

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

Each spring this woodland floor is carpeted with purplish flowers as far as the eye can see.

In an isolated field near a dilapidated barn stands this chilling portrayal of the plight of the Nuba peoples of Sudan.