A unique subway station where pillars evoke ancient civilizations.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The ground on which Shakespeare’s initial playhouse once stood.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

It holds a fabulously designed tribute to astronomer Edmond Halley.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The castle still holds traces of the abandoned Roman fort it was built atop.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Many mysteries surround these objects questioning whether they are cannonballs at all.

This modest relic, with rich history as a strategic fort through multiple eras.

This gate served as a small lock-up jail in the 14th century.

The oldest working mechanical clock in the world.

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

Check the time in 145 countries at once with this East German relic.

The largest stretch of the Berlin Wall is right on top of the former SS headquarters

Berlin's old airport.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

This "floating railway" is one of the world's oldest monorail systems.