1. Topkapi Palace, or Topkapi Sarayi in Turkish, is a sprawling complex located in Istanbul, Turkey. It was the primary residence of the Ottoman sultans for almost 400 years, from 1465 to 1856. The palace is renowned for its beautiful architecture, ornate decorations, and rich history. Here are some interesting facts about Topkapi Palace:

- The palace was originally built in the mid-15th century by Sultan Mehmet II, the conqueror of Constantinople. It underwent numerous expansions and renovations over the centuries, including during the reign of Suleiman the Magnificent in the 16th century.

- Topkapi Palace is divided into four main courtyards, each with its own unique features and functions. The first courtyard was the entrance to the palace and was home to a variety of administrative and military buildings. The second courtyard was where the sultan’s private apartments were located. The third courtyard contained the palace kitchens, while the fourth courtyard was reserved for entertainment and leisure activities.

- One of the most famous features of Topkapi Palace is its harem, which was home to the sultan’s concubines and their children. The harem was a private world within the palace, encompassing nearly 400 rooms, including living quarters, baths, and private gardens. It is estimated that as many as 300 women and 400 children lived in the harem at any given time.

- The palace is home to a number of important artifacts, including the Topkapi Dagger, a stunning jewel-encrusted dagger that was once believed to have magical powers. Other notable items include the Topkapi Spoonmaker Diamond, which is one of the largest diamonds in the world, and the Imperial Treasury, which houses a collection of priceless objects, including gold and silverware, ceremonial weapons, and religious relics.

2. Topkapi Palace is open to visitors from 9:00 am to 5:00 pm every day except Tuesdays. The palace is closed on Tuesdays. The phone number for inquiries is (+90) 212 512 0480.

3. Admission to Topkapi Palace costs 100 Turkish lira (roughly $12 USD) per person. There may be additional fees to enter special exhibits or areas within the palace, such as the harem. Visitors can purchase tickets at the palace entrance or online in advance. The palace is located in the historic district of Istanbul and can be reached by public transportation, including buses, trams, and ferries.