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

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

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

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.

Where commuters walk through remnants of an ancient Greek necropolis.

Large collection from the 3rd millennium BCE.

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

A sharp sculpture made of thousands of pieces of jagged glass.

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.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

The oldest continuously operating mint in the world that has been making coins since the 9th-century.

Claude Monet was baptized in this lavishly ornate Paris church.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This Parisian gem is one of the most incredible ethnographic museums in the world.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

A French artist's vague warning hangs over Belleville.

This bridge was constructed from the rubble of the infamous Bastille.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

The narrowest street in Paris.