Human-powered aircraft at the National Air and Space Museum.
<a href="https://en.wikipedia.org/wiki/User:350z33" class="extiw" title="wikipedia:User:350z33">350z33</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
<span class="int-own-work" lang="en">Own work</span>