Last year the Times Picayune ran a series of aerial photographs of St. Tammany Parish taken by David Grunfeld. They show a variety of locations all over the parish, with several pictures of the old Prestressed Concrete Products site on lakefront in Mandeville. Here's a link to the webpage showcasing the aerial photographs. Be sure you click on the "full screen" button to see them larger.
The St. Tammany Parish Assessor's Office has a high-resolution, zoomable aerial mosaic of the entire parish at the following link: https://atlas.geoportalmaps.com/st_tammany
You have to click on the "agree" button at the bottom right to gain access to the map. Once there you can use the menu at the right to control the view and navigate around. The "pan" control, represented by the hand symbol, is useful, and the scroll button on your mouse should operate the zooming control. The layers menu on the left allows you to switch various datasets on and off to activate different map components.
If you are more into aerial drone photography, the St. Tammany Parish Sheriff's Office did a YouTube video this year featuring low altitude drone video of their deputies driving around subdivisions, patrolling Tammany Trace, K-9 ground searches and various other sheriff's department activities. Click here to see that video.