In Survival and Prepping there are generally three types of Bug Out Location, the first is the Remote Bug Out Location, the most basic which is typically an undeveloped patch of dirt you have set aside to flee to or reside part-time at.
Having an alternate location to the one you are in can be a lifesaver. During the Katrina Disaster the exodus from the ruins of New Orleans saw those that had prepared could flee to a Bug Out Location. The best of these are remote from population centers and urban-sprawls, often in the countryside where numbers are less and natural resources plentiful.
Ideally a Bug Out Location should be accessible even in winter, have it's own water supply and be level enough to access from your vehicle nearby. It goes without saying that there should be minimal restrictions and building codes in place. The land ought to have enough acerage for you and your family plus room for future expansion.
It can be quite a search starting out even finding a suitable spot. I've known a family that bought privately through an advert a place in Washington. They paid a princely sum ($200,000) for a fully-built two-story log cabin and several acres. On the other end of the scale you could find a patch of undeveloped land through a realtor or agent that fits the bill. It all depends on what type of a BOL you are looking for.
Typically though a Remote Bug Out Location, unless developed into a Survival Retreat and Homestead, is only good for short to medium periods. Exceptions to this can be if the area has a large carrying capacity for wild game and scarcity of other people.
Tactics and Strategy for Bugging-Out
Another type of BOL is the guerrilla retreat. This is where someone sets off the beaten-track into a national forest or even a national park to secretly uses it to live on. The upshot of this method is you don't have to pay a penny in taxes, rent or down-payment. The downside is unless you are incredibly fortunate and undiscovered there's a risk of being spotted.
There are those that say 'Just take any unoccupied land when the time comes' or 'It doesn't matter what you paid'. Well that's only part of the story. You see what you've got to understand is you CANNOT realistically pre-prepare on land that is not yours. If you do, you risk it being found / discovered / looted / trashed / occupied etc. You can bug-out to land you've not paid for or don't own like National Parks, Forests etc.
Sensible survivalists are way ahead of this 'bug out and just find a place randomly'. They've gotten land set aside with buildings, gardens, preps and supplies etc etc. You can only take so much with you in one truck and trailer if in the midst of bugging-out as well. The clever survivalists are those that think years ahead of time, not at the last minute.
These days hikers, campers and busy-bodies are never far away, unless you have very remote, difficult, mountainous or hellish surroundings. The spotter planes, satellites overhead can spot changes to an area over time. This is almost always frowned upon by the BLM, Dept. of Fish and Game etc. If you are caught the punishment is normally being told to move on elsewhere. If you have built a shelter then you are screwed as that will be demolished, even cabins have been known to be pulled down. Depending on the state and the forest service authorities you can expect a camping limit of 7 to 30 days. After that time you are expected to up sticks and leave for elsewhere. Alaska and Canada are probably two the 'best' areas for this kind of thing.
Burrowing into the ground and building an underground shelter is perhaps the only way to keep utterly off the grid and out of sight without a footprint or paper-trail. From time to time stories break the news of even these locales being discovered though (normally due to a crime being investigated).
Overall, as much as it may seem a drag, paying yearly property taxes and building what you want on land you can call your own is the most viable and feasible option. Of course, post-collapse or TEOTOWAWKI all bets are off!