Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The fairy tale castle of the "fairy-tale king."

Old Danish castle immortalized in Shakespeare's Hamlet.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

This 700-year-old street food market features baby octopus and soy donuts.

The 10,000 Torii shrine.

Home to items never before seen by the public.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world

Elevated freight railway turned wildly successful urban park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This historic rec center in the heart of Israel is a bastion of peace and togetherness.

This ancient village is peopled by a religious minority and is still using some of the same materials it was built with thousands of years ago.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

After being lost for decades, this striking mural depicting the atomic bomb covers the wall of a busy Tokyo metro station.