Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

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

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The middle finger of modernity.

Go inside to really appreciate this 500-year-old technological masterpiece.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The fairy tale castle of the "fairy-tale king."

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The most visited, and possibly most controversial, museum in Germany.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

A six-ton wedding present for the King of the Scots.

This bronze statue was erected to honor a small Scottish town's beloved stray cat.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

These spartan apartments are provided to clergymen visiting Vatican City.

Breathtaking and huge 430 year old maps of Italy.

Quite simply the largest tree in the world (by volume).