limited opening hours, and fines for cyclists that were going faster than a horse's trot. It was only after mediation of the Algemene Nederlandsche Wielrijders-Bond (English: "General Dutch Cyclists Union"), that helped fund the park, that a park guard was installed and cyclists were again permitted to cycle normally. 20th century In 1936, a rose garden was created in the center of the park. One year later in 1937, the Blauwe Theehuis (English: "Blue Tearoom") was opened. This tearoom is a round modernist building, designed by the architectural office Baanders. In the following years the overall maintenance of the park became too expensive for the Vereniging tot aanleg van een rij- en wandelpark (English: "Association for the creation of a park for riding and strolling"), due to an intensified use, and in 1953 the association donated the park to the city of Amsterdam. The landscape architect Egbert Mos renovated the Vondelpark for the city in the 1950s. The purpose was improve the park for both usage and maintenance. Small bushes were grouped into larger bushes, superfluous paths were removed, and the rose garden was renovated. Also the stream of water in the "trunk" near the northern entrance of the park was removed. In the 1960s children's playgrounds were created. During the flower power era in the 1960s/1970s the Vondelpark became a symbol of a place where "everything is possible and (almost) everything is allowed". In the 1980s an open-air theatre was built. The Vondelpark received the status of rijksmonument (English: "state monument") in 1996. 21st century In the 1990s the number of visitors grew to approximately 10 million visitors annually. The grassy areas are used as sports field and the paths as bike paths. Consequently, the city renovated the park from 1999 to 2010. The purpose was to beautify the park and lessen the need for maintenance. The renovation took more than ten years in order to increase convenience for visitors and for the security of resident animals. Starting in September 2008, adults were legally allowed to have sex in the park,<ref>| work=DutchAmsterdam | title=Vondelpark: the rules (You won’t believe why dog owners are upset) | date=2008-03-14 </ref> as long as they "[took their garbage with them afterwards and never [had] intercourse near the playground. Sexual activities were to be limited to the evening hours and night.", in the words of current Amsterdam Alderman Paul Van Grieken. Facilities Open-air theatre