The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This unusual 7th-century Frankish seal offers more questions than answers about its past.

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

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

A rare example of World War I trenches from the British front.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Hamburgers are intensely proud of their tunnel beneath the river.

This lurid German fountain plots the sad course of marriage from dating to death.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Cold war icon and onetime "hole" in the iron curtain.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Home to the most complete dodo remains known - one head, and one foot.

Used as an example in one of the first dictionary entries for "museum" in 1706.

The most loyal of little dogs, or a Victorian era publicity stunt?

A sweet symbol marks the place where torturous executions were once carried out.

An old department store turned Nazi prison turned artist commune.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

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 largest greenhouse in the world is home to over one million types of plants.