As bitcoin tops the $15,000 mark, according to digital-currency website CoinDesk, finance experts are weighing in on whether or not to invest in the cryptocurrency. While some are calling it a total scam, others are advising that now's the time to buy. Regardless of which side you fall on, one thing is for sure: It would be unfortunate to misplace your bitcoin these days. Some unlucky people, however, have done just that. And they're not alone. In fact, around 2.78 million bitcoins have been lost since the cryptocurrency was created in 2009, according to Newsweek. That's almost $30 billion today. Here are three of the wildest things people are doing to recover their lost bitcoin:

1. One person has been trying to search a toxic landfill

James Howell, an IT worker in the United Kingdom, began mining bitcoin on his personal laptop in 2009. The Telegraph reports that his computer broke in 2013 but he kept the hard drive in case bitcoin became valuable one day. It did. While cleaning his home that year, he mistakenly put the drive into a waste bin at his local landfill site in Newport, South Wales, where it got buried. Now, with bitcoin's value hovering just above $15,000, Howell's 7,500 lost bitcoins are worth more than $117 million (as of Thursday afternoon). The U.K. resident wants to try searching the landfill, which reportedly has 350,000 tons of waste, but the Newport City Council won't allow it. According to tech website Wired, the landfill is not open to the public and trespassing would be considered a criminal offense. And even if the drive were recovered, it likely would no longer work after being exposed to heavy and potentially toxic waste for so long.

2. Investors are undergoing hypnotherapy

Many early Bitcoin investors are in a painful predicament. They can't remember the complex security codes they originally created to gain access to their Bitcoin wallet. Plus, there's no way to reset the password if you forget, reports Fortune and The Wall Street Journal. But there's hope on the horizon. South Carolina hypnotist James Miller has recently begun helping people recall forgotten passwords and find misplaced storage devices. "I've developed a collection of techniques," he tells the newspaper, "that allow people to access older memories or see things they've put away in a stashed spot." Miller charges one bitcoin plus 5 percent of the amount recovered for his services, although he says his rates are flexible.

3. Man hacks his Bitcoin vault