Postcrossing turns the mailbox back into something exciting: you send a postcard to a randomly assigned stranger somewhere in the world, and once it arrives, a card from another random person lands in your mailbox.

It's a tiny, warm thread of human connection across borders, and the surprise of a card from Finland or Taiwan never gets old.

The honest reality is it costs a little in postcards and international stamps, and there's a lag (mail is slow) — but the delight-per-dollar is wonderful.