The University of Copenhagen Botanical Garden (Botanisk have) covers an area of 10 hectares and is particularly noted for its extensive complex of historical glasshouses dating from 1874. The garden is part of the Natural History Museum of Denmark, which is itself part of the University of Copenhagen Faculty of Science. It serves both research, educational and recreational purposes. The botanical garden was first established in 1600 but it was moved twice before it was ultimately given its current location in 1870. It was probably founded to secure a collection of Danish medicinal plants after the Reformation had seen many convents and their gardens abandoned or demolished.References:
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.