Zealand, designed by an Austrian artist and viewed as a tourist draw in a small town. Drugs, vandalism and violent crime Some public toilets are known for drug-taking and drug-selling, as well as vandalism. This type of criminal activity is associated with all "neglected, unsupervised buildings", not just toilets, and good cleanliness and maintenance, and ideally an attendant on the premises, can act as a protection against these problems. Violent crime inside public toilets can be a problem in areas where the rate of such crimes in general is very high. In South Africa, for instance, many people have reported being afraid to use public toilets. There have been several highly publicized murders in public toilets, such as the Seocho-dong public toilet murder case in South Korea in 2016. In the US, an infamous case was the murder of a 9-year-old boy in 1998 in a San Diego county public toilet. Increasing public toilet provision can help to protect women from violent attacks. Research studies have found increased risk of women and girls being raped where there is limited or no access to safe toilets at night. Several billion people lack access to improved water and sanitation and must travel long distances or wait until night time to defecate under cover of darkness. Women and girls manage menstruation which increases their water and sanitation requirements for several days each month. Amongst the UN sustainable development goals there is a specific references to achieving access to adequate and equitable sanitation and hygiene for all paying special attention to the needs of women and girls in vulnerable situations (indicator 6.2). A study conducted by the UCLA School of Law's Williams Institute found no significant change in the number of crimes since the passage of various laws that enable transgender public toilet usage. Transgender and gender non-conforming people are at risk of violence when using the public toilet (see: trans bashing). A 2015 study by the National Center for Transgender Equality found that 59% of transgender American avoided using public facilities for fear of confrontation. This landmark study, which included 27,715 respondents, found that 24% of respondents had their presence in the restroom questioned, 12% had experienced verbal harassment, physical assault, or sexual assault when attempting to use the restroom, and 9% were denied access entirely. Several studies have found that preventing transgender people from using public toilets has negative mental health impacts,