If you want to confuse a teenager today, really take them out of their element, you could do worse than to plop him or her in a 1970 Chevelle or a vintage Lincoln Town Car.

Looking around at the ashtrays, crank windows and manual locks, sitting in what could have been their grandfather's car, they might as well be in another world.

Car design changes quickly, and features that were once standard in just about every car on the road have mostly gone the way of the dinosaur.

Who knows what the future and further advances in auto technology may bring? Perhaps one day the features you take for granted as standards for today's cars may become just as obsolete as these five rarely seen features …

car ashtray with cigar

Ashtrays

The move to ashtray-free cars began at Chrysler, whose 1995 Cirrus and Dodge Stratus sedans were the first to be sold without ashtrays as standard equipment.

Today, you're much more likely to find a power outlet for a cell phone or MP3 player where the push-in lighter once was, and ashtrays have mostly been replaced by cup holders and storage compartments.

Not only is it a question of an anti-smoking movement, but also of space. According to the Centers for Disease Control and Prevention, about 19.3 percent of adult Americans smoked in 2010 -- roughly 45.3 million people. According to Apple, more than 300 million people have bought iPods. When you add in other MP3 players, iPhones and various other smartphones, it's clear the smokers are simply outnumbered.

But they aren't totally extinct. For $15 to $100, car buyers can get a smokers group option that includes ashtrays and cigarette lighters. Plus, some luxury automakers such as Rolls Royce still include ashtrays for their humidor-owning customers.

vintage car interior with bench seats

Bench seats

If you're in the market for a pickup truck, you'll easily be able to find one with front bench seats. But if you want a car with that once-common feature, good luck.

While big cars were once renowned for their ability carry six people -- more if you didn't mind a little squishing -- the number of cars with front bench seats that can accommodate three riders has declined over the years.

A few years back, Toyota dropped the bench seat from its Avalon because 92 percent of buyers were choosing the models with bucket seats.

These days, only a handful of American-branded autos in the full-size class offer the option of six-passenger seating, including the Buick Lucerne, Cadillac DTS and Chevrolet Impala. However, bench seats remain standard equipment on the Mercury Grand Marquis and Lincoln Town Car.

2009 Nissan Versa car window crank

Window cranks

If you want to confuse a child, put him in a car with a crank window. Most kids these days have never seen anything but power windows and wouldn't know what to do with a crank handle.

In 2006, Honda became the first of the large automakers to banish the crank window, moving entirely to power windows as standard equipment.