This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

Eat the ultimate iteration of Portugal's most beloved pastry.

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

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

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

A giant interactive periodic table with real samples of the elements.

A crumbling World War I fort that is reached through a series of concrete tunnels.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A lover's walk between hilltop towns, decorated with graffiti love notes.

This tiny chapel withstood a massive mudslide and flash flood.

The bomb-ravaged remains of of a colossal Neptune.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

Five candy-colored villages on the Italian Riviera.

Drink wine handed out through a window as part of an age-old tradition.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.