Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

One of Edinburgh's most popular works of street art is located well off the beaten path.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

The fountain marks the area where hundreds of accused witches were burned at the stake.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

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

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Saintly bones pressed into a wax effigy of a Catholic superstar.

This little-known relic crypt holds stolen parts of a Roman Empress.

A mechanized clock where a man fights off a dragon, crab, and rooster.

One of Jeff Koons’s largest sculptures and his first commemorative work.

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

The unexpectedly beloved remnants of a controversial thermal power plant.

This fountain was designed to honor the man who helped bring water to Barcelona.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Turntable anonymously received orphans, alms, and groceries.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.