The loneliest island in New York.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

France's most famous cemetery, with some of its most curious tombs.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This demon atop the Notre-Dame de Paris looks utterly bored.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

Go back 50 years with a turn on one of the park's carefully restored vintage fairground rides.

This 19th-century island fort built to protect against an invasion by sea.

The only medieval bridge in Britain with its defensive tower still in tact.

An amazing collection of curiosities hidden in a small Welsh village.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

After years of slow decline, a derelict Gothic castle is now being restored to life.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The stately remains of Llywelyn the Great's mighty fortress.

Three bridges straddle a stream, one stacked upon the other.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.