There's something about secret doors that makes my spine tingle. The excitement! The mystery! But most secret doors are on the inside of a house—pull that book to reveal a hidden chamber! push that wall through!—this one, amazingly, is on the outside. It's so good you don't even see it. Read More >>

Doors are some seriously ancient tech but they have this problem where they can only keep people out if they're closed. This bizarre but clever take on the "revolving door" by a company called Barbecan, on the other hand, aims to get you inside, but simultaneously keep any ne'er-do-wells out. Specifically ne'er-do-wells with bombs and guns. Read More >>