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

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The world's oldest bookshop still in operation.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

Once known for its horse-powered knife sharpening, this 200-year-old shop offers an array of blades and hard-to-find culinary tools.

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

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

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

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

Where commuters walk through remnants of an ancient Greek necropolis.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

This modest marker near Notre Dame identifies the very center of Paris.

Architectural monsters are devouring this palace's every door and window.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.