A circle stone within a stone circle.

World's largest working waterwheel has been around for over 150 years.

The cedar tree in Highgate Cemetery earned its title by accident.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

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

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A cluttered and astounding collection of antiquities and curiosities.

Hear the quietest sound from across the dome.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

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

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.

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

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