Breathtaking Byzantine paintings cover the inside of this 12th-century church.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

These mysterious 1,000-year-old walls have revealed little about their past.

After Christopher Columbus died, his son built a fancy house to rule from.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

An abandoned Byzantine fortress and notorious prison.

A little-known park with unusual, half-ruined structures and a mystical energy.

A towering monument to war, located on a beautifully peaceful hill.

A historic blockhouse and trading post give a glimpse into the early colonial history of South Carolina.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

Where lovers tie birch branches into long-lived knots.

A powerful tribute to the victims who suffered under Ethiopia's most devastating regime.

A thriving Black community was destroyed by an angry white mob at this site in 1923.

This North Carolina store preserves a historic moment in America's movement for racial equality.

The young Black revolutionary was killed before getting to see a non-segregated pool in his hometown.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

It's good luck to be mocked by this monkey.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A submerged archeological park still holds the wonders of a Roman Sodom.