This one is kinda hard to explain, but i'll do my best...

For those of you who may have read Hannibal, he used a mnemonic strategy where you build your own house inside your mind (the manor he goes to shield himself from the pain of the torture, when he put his face against a statue)
I was really curious about how this would work, because at the time, I had litteraly no place where I could be lonely and loose myself in my thoughts.
I read a few forums about people explaining the rules they had settled for themselves to give consistency to the idea, and advices on how to make it as a realistic and clear as possible (i.e.: If you create a room, it stays, you can't change the look, colors and place whenever you want, etc...)

It took me about a year until I had figured out a plan of the house and had created a few rooms.
I use it to store memories, to each thing a place. I learned how to "lock" myself in my own mind to have a good time and relax, watching memories as if I was watching a movie, hearing echoes of music I like, etc.
Side effect included me remmembering way more stuff than I did before, pictures, colors, direction, etc, have become visually clear when I try to remmember them.

It's far from a manor. But it has become so clear over the years that it has become my place....

Sorry for crappy english, I'm unsure wether this is clear or not.

If we're only talking about physical places, there's a small beach full of peebles not too far from my place. I love to send rock skipping on the water.