An increasing number of countries are choosing to increase tourism by constructing roads and other facilities that increase access to famous cultural heritage sites. In my opinion, this is a negative development because it can damage the environment and site, either by accident or on purpose.
The primary concern about increased tourism is unintentional harm to the environment. Litter and other pollutions are obvious problems, but there are more subtle ways that even conscientious guests can hurt fragile ecosystems. For instance, I heard that by stepping off the marked path, visitors are trampling endangered native plants in the Andes Machu Picchu, a site that used to be very difficult to reach. A further major issue might be that extra cars and buses strain the environment through increased noise pollution and exhaust. Hence, tourism can harm the site even when the visitors are being careful.
An additional reason for my stance is that some people intentionally vandalize sites. If roads make it much easier to reach a site, someone may sneak in and steal valuable objects. A case in point is Tibet, which has many monasteries deep in the mountains that contain centuries-old statues. In the past, these statues were protected by the effort of carrying the priceless relics over rough terrain, but now roads make them easy to remove via trucks to sell on the black market. Accordingly, security is compromised if accessibility is increased.
Therefore, although it has become more popular for governments to make cultural sites easier for tourists to reach, it has brought about too many problems, like intentional vandalism and thoughtless pollution or damage for this to be considered a positive trend.