A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A subterranean shelter remains intact under a busy Paris railway station.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

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

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

The room where Vincent van Gogh died.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

A moving memorial to the fallen and missing from WWI trenches.

A 550-square-meter micro-nation off the coast of Britain.

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

The encased skull that is widely believed to belong to St. John the Baptist.

This historic abandoned train station looks like a stop for ghost trains.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

The Isle of Wight’s “Island Line” serviced by former London Underground trains from the 1930s.

Isaac Newton's former home, where the famous apple tree still stands.

Famously misunderstood wonder of the ancient world

A petite castle folly in the English countryside.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

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

There are hundreds of secret WWII bases hidden in British forests. Built to fight a Nazi invasion, they remained unknown for decades.

A rotting air force base is now home to rare birds and scarce plants.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.