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

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

A spectacular walk on the flank of a gorge.

A historic Christian shrine nestled within a spectacular natural cave.

Underneath one of the region's most historic roads lies the home of Plato's successor.

This lesser-visited World Heritage site in Athens boasts an impressive ensemble of medieval gold mosaics.

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

An ancient octagonal weather station named for the eight Greek gods of wind.

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow 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.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

In Portugal, a larger-than-life painting of America's first Black female firefighter.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

The former home of a Portuguese poet, artist, and collector is packed to the brim with art.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

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

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

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

One of the oldest universities in the world exhibits thousands of specimens from its 700-year-old collection.