A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Giant topiary dog once played a role in a terrorist bomb plot.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The oldest Roman lighthouse still in use.

An eerie collection of the surviving structures from a past celebration of the future.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

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

One of downtown Berlin's last reminders of its Communist past.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Real bones which are said to have belonged to a Polish dragon.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A little slice of Japan and its aesthetics in London's Holland Park.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

These 400-year-old ruins are all that's left of the monastery where Ines de Castro was assassinated by the King of Portugal.

This tower once served as a radar station during the Cold War.

Explore a remarkable 35-hectare sculpture garden located an hour outside of Lisbon.