Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

These medieval skyscrapers dominate the skyline of this small Tuscan town.

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

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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

Cliffside houses provide a spectacular view from their perch above the valley.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

Spain's largest bullring offers a unique glimpse at architecture and history.

An eerie collection of the surviving structures from a past celebration of the future.

A 16th-century Andalusian palace.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

A monument to a beloved aquatic folk hero in the Irish town of Dingle.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

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.

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

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A stunning architectural yet functional feat, towering over Oslo.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

The design of this beautifully crafted building was inspired by Norwegian glaciers.