A beautiful collection of taxidermy birds and rare pomological wax models.

The first (but not only) upside-down house in Germany.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Floating swimming pool within a moored vessel.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A surreal museum of extraordinary industrial objects.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.