Based on the fact that the Queen's House is a fair distance from the planetarium and the time ball,I would say that the answer would properly be Greenwich Park,covering almost 183 acres,southeast of the London city center.
Scifan, you gave the correct answer to the one outstanding question, so the baton is in your hands,so to speak. I attach some other pictures of the park. One I could have used as stage 3 of the reveal.
Re Harrison's Planetarium, I took some people there to enjoy a show in a really state-of-the-art place. Guess what, the computer driving the show crashed twice. So we enjoyed a rerun of the show,much to the presenter's embarrassment!
I love the juxtaposition of the moon and the midday ball.
It's heading towards the 3 hour mark without any responses to Admiral's latest challenge. I will be heading to bed myself. Should any of you like to play, Admiral will be back here in ~ 2 hours to further assist/provide clues to his latest challenge. Good luck!
It's a chunk of coal from one of the many shipwrecks on lake Erie over the years.It may have been part of a shipment heading for the Nanticoke coal fired generating station at Nanticoke,Ontario.