Much of our coverage of urban exploration involves the exploits of hardcore urban explorers who have a ton of experience scouting new spots around the globe; these folks know how to safely get inside, shoot their photos, and sneak out undetected. Doing so is no small feat, as this tragic news item from Chicago illustrates. Urban exploration is serious business, with real risks.

For those of us who aren't experienced and would prefer to learn about some of the world's foremost exploration sites without risking life and limb, here's a nice rundown of some of the most (in)famous spots in Europe and the US, courtesy of Swide. If spectating from the safety of your internet connection isn't enough, please explore safely!

The Mines of Paris

The Catacombs of Rome

The Sotteranea of Naples

The Post Office Railroad of London

The Freedom Tunnel of New York