Hundreds of hidden passageways weave through the old quarters of Lyon.

This hidden garden boasts amazing views of Lyon.

Inside this museum, Christians were imprisoned when the Romans controlled Gaul.

France's national museum of scientific and industrial instruments.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The Sun King's military models, saved from the Louvre.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

The only quarter of the Old City not dedicated to a major world religion.

A "miracle" that seems to produce more holy fistfights than holy revelations.

Sitting right on the border between East and West Jerusalem this modern art museum is in itself a symbol of Israel's hoped-for unity.

The home of the Dead Sea Scrolls is an abstract modernist dream.

The video game-themed street art first popped up in the French city.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

One of the largest squares in Europe contains an entire artificial island.

A modern zoetrope on the New York City subway.

The only surviving sidewalk clock in Brooklyn.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.