This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

This statue honors the author's groundbreaking family story.

A fortified palace in the shape of a ship on the Thiou river.

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

Elaborate tile work in this railway station tells the story of Portugal.

This beautiful spit of land was once the summer playground of the king of Spain.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

A hidden three-foot-wide house separates these two regal churches.

This church on a Tohono O'Odham reservation has stood since 1797.

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

This 19th-century fountain's namesake animal isn't what you think it is.

This enormous censer uses a pulley system installed over 400 years ago.

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

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This cemetery features modernist statues as strange as its name.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The hippo that stands on this university campus was once a drunken flea market purchase.

A church of bones, decorated with 40,000 human skeletons.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This weeping, 10-foot-tall sculpture was a maquette for a 9/11 memorial.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.