An ancient knight and a symbol of the city's freedom.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Dictionary Johnson’s favorite feline.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Giant, friendly pelicans in Central London, the most unlikely of places.

One of the oldest trees in Britain may have been witness to some of the country's formative moments.

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

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

This peaceful park with centuries of history hides in an overlooked section of South London.

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

An enormous and lavish Gothic church in Czechia.

A church of bones, decorated with 40,000 human skeletons.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A series of playful yellow penguins share a serious message about the environment.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

A mocking tribute to the past and modern leadership of Prague.