This giant wooden treehouse within a sprawling garden has its own eatery.

A winding medieval path was used by mourners to carry their dead to the nearest church.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

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

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

A solemn memorial in a majestic setting that honors a 1692 tragedy.

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

England's largest white horse isn't even white.

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

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

A small waterfall tucked away in the forest of Harmby Gill.

This historic castle was already in ruins by the 13th century.

The church and nearby castle are all that remains of a medieval village, mysteriously abandoned.

An abandoned Yorkshire castle that is hidden in plain sight.

A 22-million-year-old sandstone cave is a natural habitat for award-winning cheese.

The kind of mixed-up place that drives archaeologists crazy.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.