3. Integratron: Giant Rock, California
Built in 1978 on a "magnetic vortex", a sonic chamber within the Integratron provides the venue for "sound baths" that supposedly rejuvenate the recipient.
The visionary behind the Integratron, George Van Tassel, died before the domed structure near Joshua Tree National Park was completed. Its ability to lengthen life has never been tested, but it is open for tours (and sound baths) and rented out for special events.
Learn about Louisiana's most eccentric museum on the next page.