Remnants of the Nazis' occupation of Denmark linger along the sand.

Legend says a giant, venomous spider once dwelled within this Polish church.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

The earliest known map to show America, discovered by accident at a Paris bookshop.

An ancient Egyptian temple in the middle of Madrid, Spain.

A huge cathedral single-handedly constructed by one eccentric monk.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Venice's "Island of the Mad."