A hotspot in the picture is an area which I have identified as specially interesting. The title I gave it appears when you hold your mouse pointer over that area for a fairly short time. If you click on the area, a new, small window may open with a further picture or text, or with a new page in this or another website. When you click again on the original picture, the extra window goes behind your main window. So far I have not discovered how to close this extra window automatically; you have to click on the 'x' at its top right-hand corner.
If the titles stop appearing in the aerial photo, click anywhere in its margins, and then move over the photo again.UP