The largest stone circle in the world has ended up bringing up more questions than it has answered.

Famously misunderstood wonder of the ancient world

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

The oldest inn in England served brew to the crusaders.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Venice's "Island of the Mad."

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The plague quarantine island home to the alleged "Vampire of Venice."

One of the largest squares in Europe contains an entire artificial island.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The mark of the Devil's horns on a marble column in Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The secret medieval communication system will whisk your words above the noise of the crowd.

Amsterdam's Red Light District leaves little to the imagination.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.