The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

This is what trains will look like after the zombie apocalypse.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

When you're a great Russian Tsar, even your vomit gets a statue.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

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

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

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

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

The elegant structure of this 19th century railroad bridge creates an illusion of infinity.

This foolish Victorian sea fort was converted to a deluxe hotel.

Public access to clean drinking water was an instant hit among the masses.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

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

Surreal riveted sea forts once protected the Kent shores from German attack.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.