When this massive wooden temple ran out of rope, they made one out of devotees' hair.

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

Da Vinci's equestrian statue, 500 years in the making.

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

One man's lifetime collection of tiny objects of wisdom gathered from around the world, on display for public enjoyment.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Secret refuge and museum of the Duke of Florence.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Jesus' footprints and the first catacombs in the world.

An industrial relic is now one of Europe's most staggering art spaces.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This former steel and coal plant is now a neon-lit industrial fantasia.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

This one has sailed five times as far as Sir Francis Drake's famous ship.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Explore nearly 400 years of English middle-class home life.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A quiet memorial to those who died saving others in the heart of the City of London.

The television series' iconic giant foot was borrowed from this classical painting.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.