A medieval fresco which reminds visitors that death will come for us all.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Stalactites and stalagmites in a beautifully lit cave.

This Balinese sea temple is thought to be guarded by the hundreds of monkeys that live around it.

This sacred cave temple is home to thousands of bats and according to legend, a giant snake king.

A Balinese resort, empty and trapped in time.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Hindu temple of the dead home to hundreds of long-tailed macaques.

Hundreds of Buddhas in a re-discovered Indonesian temple.

Think you have a tough job? Try carrying 200 kilos through a cloud of sulfur down the side of a volcano.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

Real bones which are said to have belonged to a Polish dragon.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The celebrated eyesore created by starry-eyed sweethearts.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

This museum houses an imposing skeleton army comprised of creatures great and small.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.