Stone Age solar temple is aligned with the sun on each equinox and solstice.

This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

How did a lighthouse wind up in the middle of this landlocked German city?

A poignant mural honors the heroic teenage non-conformists who took on the Nazis and paid the ultimate price.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.