Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Astonishing rock formations dot the Brimham Moor landscape.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The sign at the garden gate reads: “These Plants Can Kill.”

The remains of Crystal Palace Great Exhibition of 1851.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

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

The oldest stone house in Paris was built by its most famous alchemist.

France's national museum of scientific and industrial instruments.

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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

A museum of carnival attractions where you are invited to ride the rides.

A museum which takes visitors to the côté obscure of Paris.