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

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

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

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

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

An architectural oddity hides in plain sight on this iconic London bridge.

This secret garden has bloomed into London's most unique hub of urban creativity.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

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.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

A winding cave grotto walkway built to provide employment for veterans after World War I.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A wonderfully eccentric Victorian-era museum and library.

One of England's most famous churches hides a pair of little known architectural treasures.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

This skewed English house has looked like it's going to fall over for centuries.

A vast archive of cultural artifacts collected from numerous expeditions across Africa and Asia.

An English explorer's vast natural history collection has the first realistic dioramas of animals staged in their natural habitats.