This home on a quiet suburban street is completely covered with vibrant mosaics.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

This antique prison is a tourist attraction with a sordid past.

Cliffs full of fossils at the portal to England's Jurassic Coast.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

This tiny little pool is said to be home to a malicious mermaid named Jenny Greenteeth.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A midnight snack that lights up the night.

This small collection of rare books was uniquely locked up for safe keeping.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Ship-sized kinetic sculptural fantasy.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.

A network of concealed passageways lies within a busy London Underground station.

One of Europe's oldest libraries.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.