Didn't Monty Python Predict This Years Ago?

Knights Templar-linked underground tunnel complex dating back 700 years found under rabbit hole
"A photographer has uncovered a stunning 700-year-old underground complex believed to be linked to the Knights Templar.
Beneath unassuming holes in a farmer’s field near Shifnal, in Shropshire, lie untouched caves allegedly used by the medieval order that fought during the Crusades."

Rabbit hole in farmer's field leads to 'mystery caves'

"An apparently ordinary rabbit's hole in a farmer's field leads to an underground sanctuary said to have been used by devotees of a medieval religious order - but is everything what it seems?
According to local legend, the Caynton Caves, near Shifnal, in Shropshire, were used by followers of the Knights Templar in the 17th Century.
Located less than a metre underground, they appear to be untouched structurally.
Their original purpose is shrouded in mystery, but 
Historic England, which describes the caves as a "grotto", believes they were probably built in the late 18th or early 19th Century - hundreds of years after the Templar order was dissolved."

Whatever you do, don't follow the white rabbit into this cave