Man, I sure love it when an awesome vintage concept makes a comeback, and bar carts certainly fall into this category for me.
Though they were popular in the 50's and 60's (think Mad Men), they lost popularity over the following decades, only to make a resurgence in the last few years.
And really, with their recent rise in popularity, it makes me wonder why they ever went out of style. Not only do they look great, but you can't beat the ease of them for entertaining... or to throw your own little happy hour ;)
Here are a few of my favorite spaces with bar carts:
Riviera Vintage, via Design Loves Company
Devon Dyer, via the glitterGuide
They can also double as a side table, making them multi-functional, as shown below:
You can still find vintage versions at thrift stores, flea markets, and online marketplaces, but lots of stores are now offering new versions, too. Here are a few of my favorites, priced from low to high: