Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

One of the world's largest collections of pathological specimens.

Eighty million natural history specimens call this gargantuan museum home.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

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

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

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

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

The largest Chinese cemetery in the world outside of China dates back to the 15th century.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Time-frozen department store of dangerous and dusty relics.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

Diego Rivera's massive tiled fountain and failed infrastructure project.

Frida Kahlo's childhood home, now a museum of her life and works.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

The fairy tale castle of the "fairy-tale king."

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

An exquisite collection of fairytale conveyances that puts most car museums to shame.