An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

You won't find these curiously named passageways anywhere else in England.

400-year-old garden, restored to beauty.

A striped 12th-century basilica sits in the countryside of Sardinia.

This rare and ancient Christian relic is one of Ireland’s oldest freestanding stone crosses.

Monsters and miniatures are held in equal esteem at this wondrous museum.

A tiled, multi-level garden of survival in Lyon.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

One of the largest caves in the world open to the public.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

To fit bodies into this Renaissance crypt, they were first left to decompose in the crypt's rotting room.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The old church, buried by the 1784 Mount Vesuvius eruption, is a remarkably well-preserved place where people now pray for the souls of the dead.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

David Sedaris called it "The greatest shop in the world."

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.