There is a belief that spiritual development can be enhanced by visiting, praying at or staying at, sacred sites. But what actually is a sacred site? The Dalai Lama once stated that a site becomes holy by the power of the individual spiritual practitioner who lives there. Another reason why a site or area may be holy is because it has a combination of metals, crystals and magnetic fields that enhance efforts to develop our spiritual side. Some of the best known holy sites include Jerusalem, Delphi, Stonehenge, and Mecca. In recent decades, new ones have been added such as Sedona, Arizona. 
    Unfortunately, sacred sites don't stay that way forever. When one of them starts to attract a lot of tourists, especially tourists who are not following a spiritual path, it affects the site until it reaches a point where it is no longer sacred. For that reason, it is probably pointless to travel to any ancient sacred site with the idea of doing so to aid spiritual development (of course, you can visit those sites strictly for the history). I even question whether it is worthwhile traveling any significant distance to visit some of the more modern spirtual sites like Sedona. For most people, you are probably better off just going to a park, a forest, or a mountain top close to where you live rather than traveling hundreds of miles to visit these sites, unless you just like to travel.