A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

Organisms normally seen under a microscope decorate this church.

Decorative shell walls built in the 1940s sit atop an ancient midden created by the Calusa Native Americans.

The largest retailer of seashells in the world.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A unique seaside cave where Aleister Crowley faked his own death.

A model solar system adds a celestial touch to this suburban park.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Commonly acknowledged as the only public monument to the Devil himself.

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

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This charming candle shop has been in business since 1789.

The world's oldest bookshop still in operation.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.