A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Everyone's favorite clay duo immortalized in bronze.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

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

The Birthplace of the Englishman who founded the A.C. Milan football club.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

When the public was consulted about a new piece of street art, they naturally asked for an enormous metal dragon.

A curious urban windmill once owned by a renowned British mathematical physicist.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

These 90-year-old murals of local kings, Vikings, and outlaws hide in plain sight in a beautifully baroque shopping arcade.

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

The English Civil War began right here in 1642.

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

The painting on an aptly named street honors the 1980s slasher movie.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

At night, the enormous sculpture looks like a UFO hovering above the English hills.

The last of the 19th-century booze-free bars has been slinging teetotal tonics for over a century.

This tower is all that remains of a 19th-century schoolhouse that became a famous music venue before its destruction.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

This tower was constructed to commemorate the man who helped bring true democracy to the United Kingdom.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

A bench and a bridge pay tribute to Birmingham's favorite heavy metal band.