Every four years, millions of salmon fill a river so densely that its waters appear deep crimson.

This stately Victorian-era burial ground overlooking the Pacific Ocean is home to the graves of some of British Columbia's most famous figures.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

This small beach park is littered with a collection of unique driftwood sculptures.

This 820-foot-high spiral ramp is a walkway to the sky.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

Old Danish castle immortalized in Shakespeare's Hamlet.

The geomorphology of the Turia Valley could easily be mistaken for Utah or Arizona.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

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

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

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

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

A hidden highland of peaks and pastures, largely unchanged since medieval times.

Defy gravity at this fascinating Pyrenees overlook platform.

Historic medieval fortified city in southwest France.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Hundreds of hidden passageways weave through the old quarters of Lyon.

The world's tallest bridge is also possibly the most elegant.

This ancient theater was once the home of fierce gladiatorial battles.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.