The camera-toting gargoyle juts out from the exterior of a Gothic cathedral.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Berlin's old airport.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Remnants of a Victorian garden feature sitting in public woodland.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Eighty million natural history specimens call this gargantuan museum home.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The attic of a four-century-old canal house hides a clandestine church.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.