Jeff Bezos will fly at the highest risk of his life in a few short weeks, traveling 62 miles above the Earth and almost to the edge of space.

The soon-to-be-ex-Amazon CEO is something of an adventurer, what with his trips out to sea or to the bottom of caves. However, he is not particularly unique among his peers in this regard; in fact, a passion for extreme experiences appears to be a characteristic shared by many billionaires from around the world.

These 4 businesses are leading the way in “space vacations,” offering everything from giant balloon flights to hotels in orbit.

Bezos is not the only executive who is enthusiastic about space exploration, either. All of the following individuals have expressed interest in leaving the planet Earth: Elon Musk, Richard Branson, Paul Allen, and Sergey Brin.

There are many other billionaires with extreme interests, though it seems that the world’s wealthiest individuals are most fascinated by space travel.

Extreme travel, including now space travel, have all been funded by Jeff Bezos’ vast financial resources.