A quiet memorial to those who died saving others in the heart of the City of London.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Charles Babbage's proto-computer, painstakingly brought to life.

English antique dealers with a taste for the unusual.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The anatomical-pathological collection of a man who changed surgery.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Hidden beneath the streets of London is a secret subway that only carried mail.

A Faraday Cage protects cars from a nearby high-power transmitter.

Small museum dedicated to one of the founding fathers of modern astronautics.

An ornate century-old elevator still connects the two halves of Bad Schandau.

An exquisite panometer representing Dresden as it was from 1695 to 1760.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Enter the cabin of a life-sized Hindenburg replica.

The great Danube river starts here.