The Center
http://math.ucr.edu/home/baez/physics/Relativity/GR/centre.html 
https://www.livescience.com/62547-what-is-center-of-universe.html 

Hoag's Object
https://www.nasa.gov/multimedia/imagegallery/image_feature_1747.html 

The Unicorn Constellation
https://en.wikipedia.org/wiki/Monoceros 
https://www.sciencefocus.com/space/the-nine-most-mysterious-objects-in-the-universe/ 

The Great Attractor
https://en.wikipedia.org/wiki/Great_Attractor 

The Cold Spot
https://www.independent.co.uk/news/science/parallel-universe-proof-multiverse-cold-spot-cosmic-microwave-background-cmb-a7743216.html 

Other Dimensions of Space
https://en.wikipedia.org/wiki/Parallel_universe 

The Filaments
https://www.sciencealert.com/non-thermal-radio-filament-touching-sagittarius-a-mystery 
 
The Great Nothing
https://en.wikipedia.org/wiki/Bo%C3%B6tes_void 

The Space Between
https://en.wikipedia.org/wiki/Rogue_planet

The Beyond
https://www.universetoday.com/1455/podcast-what-is-the-universe-expanding-into/ 
https://www.telegraph.co.uk/science/2016/05/31/multiple-big-bang-theory-could-bring-copernican-revolution-says/