The sumptuous ceiling was one of the last things Charles I saw before his execution.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This Transylvanian church has changed its denomination four times.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

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

Once a train station along the Great Eastern Railway this vibrant coffee shop and bar is where members of London’s creative class mingle.

Pop culture has helped to keep this iconic British building from being destroyed.

A hands-off space for graffiti artists to hone and display their skills.

The red letters in the literary pavement leading to the library form a mysterious code.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

This bridge was constructed from the rubble of the infamous Bastille.

A surrealist timepiece by the artist of melting clocks.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

One of the indelible moments of the American Revolution took place at this location.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.

Be on the lookout for the symbolic insect all over the city.