1. Avala Mountain, also known as Planina Avala, is a prominent natural landmark located just south of Belgrade, the capital city of Serbia. It is part of the Avala-Kosmaj geological area and is one of the closest mountains to Belgrade.

- The mountain has a diverse flora and fauna, with several protected species of plants and animals. It is particularly known for its oak and beech forests.

- One of the main attractions on Avala Mountain is the Avala Tower, a telecommunications tower and observation deck that offers panoramic views of Belgrade and its surroundings. The tower was originally constructed in 1965 but was destroyed during the NATO bombing in 1999. It was rebuilt in 2009 and has become a popular tourist destination.

- Another notable attraction is the Monument to the Unknown Hero, a memorial dedicated to the fallen soldiers of World War I. It is located at the top of Avala Mountain and is a significant historical landmark in Serbia.

- Avala Mountain also offers various recreational activities such as hiking, picnicking, and nature walks. There are several marked trails available for visitors to explore the mountain’s natural beauty.

2. The working time of Avala Tower and access to Avala Mountain can vary depending on the season. It is recommended to check the official website or contact the Avala Tower directly for up-to-date information. Unfortunately, specific contact information regarding a phone number is not available at the moment.

3. As for ticket information, there is an admission fee to access the Avala Tower and the observation deck. The prices may vary, and it is best to check the official website or contact the tower for detailed information on ticket prices.

Transportation to Avala Mountain is relatively accessible from Belgrade. Visitors can take a taxi or use public transportation such as buses or trams to reach the mountain. There are also parking facilities available for those who prefer to drive. The exact transportation options and routes may vary, and it is recommended to consult local resources or use a navigation app for the most convenient travel route.