This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

A unique underground structure dating back to the 1st century BC.

Home to fantastic views and ancient graves.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This museum documents the ancient practice of salt production in Figueira da Foz.

This museum is home to one of the biggest collections of printing press technology—plus a river view.

This oddly shaped church resembles a rocket.

This historic streetcar system has been running since the 19th-century.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

A fortress off the West coast of Portugal that dates back to 1502.

Iron Age runes and ruins hide in plain sight along this Portuguese beach.

Ancient catacombs form the foundation for this Rococo orgy of a church.

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

Head to this repurposed Renault van for fiery sausages and fries.

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

Grab a life-changing ham sandwich at this former horse butchershop.

A letterpress workshop committed to the art of printing, with unique and creative designs.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

This oddly shaped boulder in Paris is rumored to be cursed.

A striking eight-story-high obelisk perched on a coastal California cliff.