An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

Many of the tombs contain victims of yellow fever epidemics.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

Single runway interrupted by a busy road that cuts across its middle.

Engineering ingenuity during the battle of Gibraltar.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Northern Ireland's Brobdingnagian stepping stones.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

A marvel of Byzantine engineering under the streets of Istanbul.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Cold war icon and onetime "hole" in the iron curtain.

This stunning concert hall has become a symbol of Iceland's national recovery.

Climb inside an iron crystal magnified 165 billion times its normal size.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most loyal of little dogs, or a Victorian era publicity stunt?

Famously misunderstood wonder of the ancient world

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