A unique waterfall that some believe attracts the fairfolk.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Avant garde house of Pierre Cardin on the Cote d’Azur.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

The narrowest street in Paris.

This Parisian café sticks almost exclusively to an ethos of reuse.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This massive library holds what was once the largest book collection in the world.

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

Bacteria and algae give the salty water its bubblegum hue.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Mountain where Jesus was first tempted by the Devil.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Source for a sizable portion of Egypt's freshwater supply is more than an optical illusion.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

The forgotten mummies of Dakhla oasis.

The deadliest diving spot in the world is also a stunning geological marvel.