This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

When the imprisoned pope's remains were finally returned to the Vatican, his heart stayed behind in France.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

The video game-themed street art first popped up in the French city.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

One of the oldest bridges in Norwich was used during the English witch trials and is said to be haunted.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

An abandoned, desolate train tunnel that was used during World War II.

This abandoned hospital village was once viewed as an innovative way to deal with mental illness.

A memorial commemorating the only Scottish police investigation into an extraterrestrial incident.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

Enter the world under the hill at this ancient UK burial chamber.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.