Castle door

Abstract

A fun experiment: whisper in front of one of the grooves around the door while someone else sticks his/her ear to the same groove on the other side. You will discover a little-known acoustic feature of the castle entrance!

Disclaimer

In the English version, all places feature a short overview, but not necessarily a full-blown description.

More information

• You may find information about Castle door on Wikipedia.

• There is also information on this official website. Unfortunately, we can't guarantee that it's mobile-friendly.