Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Famously misunderstood wonder of the ancient world

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Elevated freight railway turned wildly successful urban park.

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