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

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

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

This church is dedicated to the patron saint of seafarers.

This 18th-century former mosque held the first Hellenic Parliament.

An allegorical statue of a giant pregnant woman representing justice and truth.

Geothermal waterfalls in Tuscany.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The current seat of the Parliament of Andalusia was once the epicenter of the Great Plague of Seville.

This abandoned viewing platform has become a monument to unnecessary government spending.

Replica of Seville, Spains famous Giralda, a former minaret converted into a bell tower.

The fragmented remains of a massive public bath connected to the city's water supply.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

Long tunnels run under the ancient chariot racing circuit to the tower.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

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

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

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